IPv6 - NVIDIA Docs

IP version 6 (IPv6) is a routing protocol which succeeds IPv4. With the expansion of the Internet and databases IPv6 addresses consist of 128 bits whose purpose is to allow networks to include a significantly higher number of nodes by increasing the pool of available unique IP addresses. IPv6 packets alleviate overhead and allow for future customizability.

Textual representations of IPv6 addresses consist of 128 bits made up from eight 16-bit hexadecimal numbers separated by colons. IPv6 addresses may be abbreviated as follows:

You may omit leading zeros in each 16-bit sequence
You may replace an entire sequence with a double colon if it equals zero

For example, these addresses represent the same IPv6 address:

af23:0000:0000:0000:1284:037d:35ce:2401
af23:0:0:0:1284:37d:35ce:2401
af23::1284:37d:35ce:2401

IPv6 addresses typically denote a 64-bit network prefix and a 64-bit host address.

Features that Support IPv6

The following are the features IPv6 is supported on:

Static Routes
ECMP
Neighbor Discovery
BGP
BFD for BGP (IPv6), and Static Routes
DHCPv6 Relay

Neighbor Discovery Protocol

Neighbor Discovery (ND) decides relationships between neighbors and replaces ARP, ICMP, and ICMP redirect in IPv4.

Five kinds of ICMPv6 packets are defined by ND:

Neighbor advertisement
Router advertisement
Neighbor solicitation
Router solicitation
Redirect

ND checks whether a neighboring node’s address has changed, whether the neighbor is still reachable, and also resolves the address of the neighbor which a packet is being forwarded to. ND is also useful for network nodes for discovering other nodes and performing basic link-layer configuration.

Configuring IPv6

To configure Router1:

Enable IP routing. Run:

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            switch (config)# ip routing

Enable forwarding IPv6 unicast packets. Run:

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            switch (config)# ipv6 routing

Configure the VLAN interfaces. Run:

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            switch (config)# interface vlan 10
switch (config interface vlan 10) # exit
switch (config)# interface vlan 30
switch (config interface vlan 30) # exit
switch (config)# interface vlan 50
switch (config interface vlan 50) # exit

Enable IPv6 on the VLAN interfaces. Run:

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            switch (config)# interface vlan 10 ipv6 enable
switch (config)# interface vlan 30 ipv6 enable
switch (config)# interface vlan 50 ipv6 enable

Configure IPv6 addresses for each one of the VLAN interfaces. Run:

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            switch (config)# interface vlan 10 ipv6 address 2101:db01::1 /64
switch (config)# interface vlan 30 ipv6 address 2103:db01::2 /64
switch (config)# interface vlan 50 ipv6 address 2105:db01::1 /64

Configure IPv6 unicast on port 2. Run:

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            switch (config)# ipv6 route 2002:db01:: /64 2101:db01::2

Configure IPv6 unicast on port 8. Run:

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            switch (config)# ipv6 route 2002:db01:: /64 2105:db01::2

To configure Router2:

Disable prefix mode on the CLI. Run:

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            switch (config)# no cli default prefix-mode enable

Enable the VLANs on the system. Run:

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            switch (config)# vlan 10
switch (config vlan 10) # exit
switch (config)# vlan 20
switch (config vlan 20) # exit
switch (config)# vlan 50
switch (config vlan 50) # exit

Configure the switch ports to accept the VLANs of which they are part only. Run:

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            switch (config)# interface ethernet 1/1 switchport access vlan 10  // port2
switch (config)# interface ethernet 1/2 switchport access vlan 50  // port8
switch (config)# interface ethernet 1/36 switchport access vlan 20 // port5

Disable spanning tree. Run:

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            switch (config)# no spanning-tree

Enable forwarding IPv6 unicast packets. Run:

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            switch (config)# ipv6 routing

Configure the VLAN interfaces. Run:

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            switch (config)# interface vlan 10
switch (config interface vlan 10) # exit
switch (config)# interface vlan 20
switch (config interface vlan 20) # exit
switch (config)# interface vlan 50
switch (config interface vlan 50) # exit

Configure IPv6 addresses for each one of the VLAN interfaces. Run:

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            switch (config)# interface vlan 10 ipv6 address 2101:db01::2 /64
switch (config)# interface vlan 20 ipv6 address 2102:db01::1 /64
switch (config)# interface vlan 50 ipv6 address 2105:db01::2 /64

Configure IPv6 unicast on port 1. Run:

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            switch (config)# ipv6 route 2103:db01:: /64 2101:db01::1

Configure IPv6 unicast on port 7. Run:

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            switch (config)# ipv6 route 2103:db01:: /64 2105:db01::1

Ping neighbor to verify IPv6 configuration:

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            switch (config)# ping6 2101:db01::2
PING 2101:db01::2(2101:db01::2) 56 data bytes
64 bytes from 2101:db01::2: icmp_seq=1 ttl=64 time=0.371 ms
64 bytes from 2101:db01::2: icmp_seq=2 ttl=64 time=0.620 ms
64 bytes from 2101:db01::2: icmp_seq=3 ttl=64 time=0.192 ms
64 bytes from 2101:db01::2: icmp_seq=4 ttl=64 time=0.277 ms
64 bytes from 2101:db01::2: icmp_seq=5 ttl=64 time=0.231 ms

IPv6 Commands

ipv6 enable

	ipv6 enable no ipv6 enable Assigns automatic link-local IPv6 address to the interface. The no form of the command de-assigns that automatic local address and disables IPv6 if no static IPv6 address has been assigned to the interface.
Syntax Description	N/A
Default	Unassigned
Configuration Mode	config interface vlan config interface loopback config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated notes and command description
Example	switch (config vlan 10) # ipv6 enable
Related Commands
Notes	Assigning an IPv6 address to an interface also enables IPv6 processing on the interface.

ipv6 address

	ipv6 address <ipv6-address> /<length> no ipv6 address [<ipv6-address> [/<length>]] Enables IPv6 processing and assigns an IPv6 address to the interface. The no form of the command removes the specified IPv6 address. If no address is specified, then all addresses of the interface are removed.
Syntax Description	ipv6-address	IPv6 address
Syntax Description	length	Mask length for the associated address space Range: 1-128 The mask length may be configured without a space (i.e. <ipv6-address>/<length>)
Default	N/A
Configuration Mode	config interface vlan config interface loopback config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated syntax description and example output
Example	switch (config vlan 10) # ipv6 address 2001::1 /120 switch (config vlan 10) # ipv6 address 2001::1/120
Related Commands
Notes	An interface may have up to 16 IPv6 address assignments

ipv6 nd managed-config-flag

	ipv6 nd managed-config-flag no ipv6 nd managed-config-flag Sets the managed address configuration flag in IPv6 router advertisements. The no form of the command restores the default setting.
Syntax Description	N/A
Default	Managed address configuration flag is not set
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated configuration mode
Example	switch (config vlan 10) # ipv6 nd managed-config-flag
Related Commands
Notes

ipv6 nd ns-interval

	ipv6 nd ns-interval <period> no ipv6 nd ns-interval Configures the interval between IPv6 neighbor solicitation (NS) transmissions. The no form of the command restores the default value.
Syntax Description	period	Time in milliseconds Range: 1000-4294967295
Default	1000
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated configuration mode
Example	switch (config vlan 10) # ipv6 nd ns-interval 1500
Related Commands
Notes

ipv6 nd other-config-flag

	ipv6 nd other-config-flag no ipv6 nd other-config-flag Indicates that other configuration information is available via DHCPv6. The no form of the command removes the other configuration flag.
Syntax Description	N/A
Default	Not set
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated configuration mode
Example	switch (config vlan 10) # ipv6 nd other-config-flag
Related Commands
Notes

ipv6 nd prefix

	ipv6 nd prefix <ipv6-address> /<length> [no-autoconfig] [no-onlink] [valid-time {<time> \| infinite}] [preferred-time {<time> \| infinite}] ipv6 nd prefix <prefix> no-advertise no ipv6 nd prefix <prefix> Configures inclusion for router advertisements (RAs) for neighbor. The no form of the command removes the corresponding IPv6 nd prefix.
Syntax Description	ipv6-address	IPv6 address
	length	Prefix length for the associated address space Range: 1-128
	no-advertise	Prevents advertising of the specified default prefix
	valid-time	Time in seconds Range: 0-4294967295
	preferred-time	Time in seconds Range: 0-4294967295
	no-autoconfig	Indicates that the prefix cannot be used for stateless address configuration
	no-onlink	Indicates that the prefix cannot be used for on-link determination
Default	valid-time: 2592000 seconds preferred-time: 604800 seconds no-autoconfig: Reset, autoconfig enabled no-onlink: Reset, on-link determination is enabled
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated syntax description, configuration mode and default values
Example	switch (config vlan 10) # ipv6 nd prefix 2001::1 /120
Related Commands
Notes	Valid time must be larger than preferred time By default, the router advertises all configured sunbnets on the interface

ipv6 nd ra dns-servers lifetime

	ipv6 nd ra dns-servers lifetime {<time> \| infinite} no ipv6 nd ra dns-servers lifetime Advertises a lifetime of a Recursive DNS Server (RDNSS). The no form of the command resets the lifetime value to default.
Syntax Description	time	Possible values: 0 –RDNSS address can no longer be used 1-4294967295 in seconds
Syntax Description	infinite	A value of all one bits (0xffffffff) and “infinite” represents infinity
Default	If no lifetime period is configured on the interface, the default value is 1.5 times the Router Advertisement (RA) interval set by the command “ipv6 nd ra interval”
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated command and syntax description, configuration mode and default values
Example	switch (config vlan 10) # ipv6 nd ra dns-servers lifetime infinite
Related Commands
Notes	Using the RDNSS and DNSSL options, an IPv6 host can perform IPv6 address network configuration and DNS information simultaneously, without using DHCPv6 for the DNS configuration A lifetime value set for an individual RDNSS overrides this value The lifetime value is the maximum amount of time after a route advertisement packet is sent that the RDNSS referenced in the packet may be used for name resolution

ipv6 nd ra dns-server

	ipv6 nd ra dns-server <ipv6 address> [lifetime [<time> \| infinite]] no ipv6 nd ra dns-server [<ipv6 address>] Configures the IPv6 address of a Recursive DNS Server (RDNSS) to include in the neighbor-discovery router advertisements (RAs). The no form of the command removes the RDNSS from the configuration.
Syntax Description	ipv6 address	IPv6 address of RDNSS
	lifetime	Maximum lifetime value for the specified RDNSS entry. Possible values: 0 –RDNSS address can no longer be used 1-4294967295 in seconds
	infinite	A value of all one bits (0xffffffff) and “infinite” represents infinity
Default	If no lifetime period is configured on the interface, the default value is 1.5 times the Router Advertisement (RA) interval set by the command “ipv6 nd ra interval”
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated command, example and syntax description, configuration mode and default values
Example	switch (config vlan 10) # ipv6 nd ra dns-server 2001::1 lifetime infinite
Related Commands
Notes	Including RDNSS information in RAs provides DNS server configuration for connected IPv6 hosts without requiring DHCPv6 Multiple servers can be configured on the interface by using the command repeatedly A lifetime value for the RDNSS can optionally be specified with this command, and overrides any default value configured for the interface using the ipv6 nd ra dns-servers lifetime command

ipv6 nd ra dns-suffixes lifetime

	ipv6 nd ra dns-suffixes <domain-name> lifetime {<time> \| infinite} no ipv6 nd ra dns-suffixes <domain-name> lifetime Advertises a lifetime of a DNS Search List (DNSSL). Using RDNSS and DNSSL options, an IPv6 host can perform IPv6 address network configuration and DNS information simultaneously, without using DHCPv6 for the DNS configuration. The no form of the command resets the lifetime value to its default.
Syntax Description	time	Possible values: 0 –RDNSS address can no longer be used 1-4294967295 in seconds
Syntax Description	infinite	A value of all one bits (0xffffffff) and “infinite” represents infinity
Default	If no lifetime period is configured on the interface, the default value is 1.5 times the Router Advertisement (RA) interval set by the command “ipv6 nd ra interval”
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated command, example and syntax description, configuration mode and default values
Example	switch (config vlan 10) # ipv6 nd ra dns-suffix domain.com lifetime infinite
Related Commands
Notes	The DNSSL contains the domain names of DNS suffixes for IPv6 hosts to append to short, unqualified domain names for DNS queries

ipv6 nd ra dns-suffix

	ipv6 nd ra dns-suffix <domain-name> [lifetime {<time> \| infinite}] no ipv6 nd ra dns-suffix [<domain-name>] Creates a DNS search list (DNSSL) to include in the neighbor-discovery Router Advertisements (RAs). The no form of the command removes the DNSSL from the configuration.
Syntax Description	domain-name	Domain suffix for IPv6 hosts to append to short unqualified domain names for DNS queries The suffix must contain only alphanumeric characters, “.” (periods), “-” (hyphens), and must begin and end with an alphanumeric character
	lifetime	Maximum lifetime value for the specified DNSSL entry
	time	Possible values: 0 –DNSSL must not be used for name resolution 1-4294967295 in seconds
	infinite	A value of all one bits (0xffffffff) and “infinite” represents infinity
Default	If no lifetime period is configured on the interface, the default value is 1.5 times the Router Advertisement (RA) interval set by the command “ipv6 nd ra interval”
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated command, example and syntax description, configuration mode and default values
Role	admin
Example	switch (config vlan 10) # ipv6 nd ra dns-suffix domain.com lifetime infinite
Related Commands
Notes	The DNSSL contains the domain names of DNS suffixes for IPv6 hosts to append to short, unqualified domain names for DNS queries Multiple DNS domain names can be added to the DNSSL by reusing the command A lifetime value for the DNSSL can optionally be specified with this command which overrides any default value configured for the interface using the command “ipv6 nd ra dns-suffixes lifetime”

ipv6 nd ra hop-limit

	ipv6 nd ra hop-limit <limit> no ipv6 nd ra hop-limit Sets a suggested hop-limit value to be included in route advertisement (RA) packets. The no form of the command resets the parameter to its default value.
Syntax Description	limit	The hop-limit value to be included by attached hosts in outgoing packets. 0 –unspecified (by this router) 1-255 –number of hops
Default	Limit value is 64
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated configuration modes
Example	switch (config vlan 10) # ipv6 nd ra hop-limit 70
Related Commands
Notes

ipv6 nd ra interval max-period

	ipv6 nd ra interval max-period <time> [min-period <time>] no ipv6 nd ra interval Configures the interval between IPv6 router advertisement (RA) transmissions. The no form of the command resets the parameter to its default value.
Syntax Description	time	Maximum interval between successive IPv6 router advertisement transmissions Range: 4-1800 seconds
Syntax Description	min-period	Minimum interval between successive IPv6 router advertisement transmissions: Default is used if no parameter is given 4-1800
Default	max-period: 600 seconds min-period: See Note
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated syntax description, configuration modes and notes
Example	switch (config vlan 10) # ipv6 nd ra interval max-period 600
Related Commands
Notes	The min-period must be 0.33 * <max-period> if <max-period> is >= 9 seconds; otherwise, the default is Router Advertisement Interval The parameter min-period must be no less than 3 seconds and no greater than 0.75*max-period

ipv6 nd ra lifetime

	ipv6 nd ra lifetime <time> no ipv6 nd ra lifetime Router lifetime is associated with a router’s usefulness as default route, it does not apply to information contained in other message fields or options. Options that need time limits for their information include their own lifetime fields. The no form of the command resets the parameter to its default value.
Syntax Description	time	The router lifetime specifies the period that the router can be considered as a default router by RA recipients in seconds. 0 –the router should not be considered a default router on this interface 1-9000 –lifetime period advertised in RAs should not be less than the max router advertisement interval
Default	3*<router advertisement interval>
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Added support for IPv6
Example	switch (config vlan 10) # ipv6 nd ra lifetime 300
Related Commands
Notes

ipv6 nd ra mtu suppress

	ipv6 nd ra mtu suppress no ipv6 nd ra mtu suppress Suppresses advertisement (RA) MTU option sent to router. MTU option ensures all nodes on a link use the same MTU value. The no form of the command restores the MTU option to enabled.
Syntax Description	N/A
Default	Suppressed
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated command Syntax and configuration mode
Example	switch (config vlan 10) # ipv6 nd ra mtu suppress
Related Commands
Notes	If not suppressed, MTU of the interface is advertised.

ipv6 nd ra suppress

	ipv6 nd ra suppress [all] no ipv6 nd ra suppress Suppresses periodic and solicited IPv6 router advertisement (RA) transmissions. The no form of the command restores the transmission of RAs.
Syntax Description	all	Configures the switch to suppress all RAs, including those responding to a router solicitation.
Default	Only unsolicited RAs transmitted periodically are suppressed
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated command syntax and configuration mode
Example	switch (config vlan 10) # ipv6 nd ra suppress all
Related Commands
Notes

ipv6 nd reachable-time

	ipv6 nd reachable-time <time> no ipv6 nd reachable-time Sets the time period the switch includes in the reachable time field of outgoing advertisements (RAs). The no form of the command resets the parameter to its default value.
Syntax Description	time	In milliseconds; the reachable time defines the period that a node assumes a neighbor is reachable after having received a reachability confirmation. Values: 0 –unspecified by router 1 –3600000 the period that a node assumes a neighbor is reachable
Default	0 (unspecified)
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated command syntax, configuration mode and notes
Example	switch (config vlan 10) # ipv6 nd reachable-time 30000
Related Commands
Notes	RAs that advertise zero seconds indicate that the router does not specify a reachable time

ipv6 nd router-preference

	ipv6 nd router-preference {high \| medium \| low} no ipv6 nd router-preference Sets the value the switch enters in the default router preference (DRP) field of router advertisements (RAs) it sends. The no form of the command resets the parameter to its default value.
Syntax Description	N/A
Default	Medium
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated configuration modes
Example	switch (config vlan 10) # ipv6 nd router-preference high
Related Commands
Notes	IPv6 hosts maintain a default router list from which to select a router for traffic to offlink destinations. The router’s address is then saved in the destination cache. The neighbor discovery protocol (NDP) prefers routers that are reachable or probably reachable over routers whose reachability is unknown or suspect. For reachable or probably reachable routers, NDP can either select the same router every time or cycle through the router list. DRP values specify a host’s preferred router. If router lifetime is zero, preference value must be medium

ipv6 nd retrans-timer

	ipv6 nd retrans-timer <time> no ipv6 nd retrans-timer Advertises the time between consecutive neighbor solicitation (NS) messages. The no form of the command resets the parameter to its default value.
Syntax Description	time	In milliseconds; the time between retransmitted neighbor solicitation messages. Possible values: 0 –unspecified Range –1000-4294967295
Default	0 (unspecified)
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated command syntax, configuration mode and example output
Example	switch (config vlan 10) # ipv6 nd retrans-timer 1000
Related Commands
Notes

ipv6 nd redirects

	ipv6 nd redirects no ipv6 nd redirects Enables sending ICMPv6 redirect messages. The no form of the command disables sending ICMPv6 redirect messages.
Syntax Description	N/A
Default	Disabled
Configuration Mode	config interface vlan
History	3.4.1100
Example	switch (config interface vlan 10) # ipv6 nd redirects
Related Commands
Notes

ipv6 nd dad attempts

	ipv6 nd dad attempts <number> no ipv6 nd dad attempts Sets the number of consecutive neighbor solicitation messages sent for duplicate address detection (DAD) validation. The no form of the command resets the value to its default.
Syntax Description	number	Number of attempts: 0 –DAD is not performed Range: 1-1000
Default	1
Configuration Mode	config interface vlan config interface ethernet configured as a router port interface config interface port-channel configured as a router port interface
History	3.4.1100
History	3.6.4110	Updated configuration mode
Role	admin
Example	switch (config vlan 10) # ipv6 nd dad attempts 10
Related Commands
Notes

clear ipv6 neighbors

	clear ipv6 neighbors {ethernet <slot> /<port> \| port-channel <port-channel> \| vlan <vlan-id>} [<ipv6-addr>] Removes the specified dynamic IPv6 neighbor discovery cache entries.
Syntax Description	ethernet	Ethernet port (<slot>/<port>)
	vlan	VLAN interface
	ipv6-addr	IPv6 address
Default	N/A
Configuration Mode	config
History	3.4.1100
History	3.6.4110	Updated command
Example	switch (config) # clear ipv6 neighbors ethernet 1/4
Related Commands
Notes	Commands that do not specify an IPv6 address remove all dynamic entries for the listed interface Commands that do not specify an interface remove all dynamic entries

ipv6 route

	General route: ipv6 route [vrf <vrf-name>] {<ipv6-prefix> \| <ipv6-address> /<length>} <next-hop-ipv6-address> [<distance>] Local route: ipv6 route [vrf <vrf-name>] {<ipv6-prefix> \| <ipv6-address> /<length>} ipv6 route [<distance>] Drop route: ipv6 route [vrf <vrf-name>] {<ipv6-prefix> \| <ipv6-address> /<length>} null0 [<distance>] Delete route(s): no ipv6 route [vrf <vrf-name>] {<ipv6-prefix> \| <ipv6-address> /<length>} [<next-hop-ipv6-address>] Creates an IPv6 static route. The no form of the command deletes static routes.
Syntax Description	ipv6-address	IPv6 address
	ipv6-prefix	IPv6 address + mask length without space (e.g. a1:a2::33/64)
	length	Prefix length for the associated address space Range: 1-128
	next-hop-ipv6-address	IPv6 address of the next-hop
	distance	Administrative distance assigned to route. Options include: No parameter –route is assigned a default administrative distance of 1 1-255 –the administrative distance assigned to route
	null0	Creates a black hole route with action DROP
Default	No distance parameter indicated: Administrative distance of 1
Configuration Mode	config
History	3.4.1100
	3.6.4110	Updated command
	3.9.1600	Removed ethernet, port-channel, and vlan options
Example	switch (config) # ipv6 route 3003:db01:: /64 2001:db01::1
Related Commands
Notes	Static routes have a default administrative distance of 1 Assigning a higher administrative distance to a static route configures it to be overridden by dynamic routing data Multiple routes which are configured to the same destination with the same administrative distance comprise an Equal Cost Multi-Path (ECMP) route A no command not including a source deletes all statements to the destination Route with distance value 255 is not inserted to the forwarding table

ipv6 routing

	ipv6 routing no ipv6 routing Enables forwarding IPv6 unicast packets. The no form of the command disables IPv6 unicast routing.
Syntax Description	N/A
Default	Disabled
Configuration Mode	config
History	3.4.1100
Example	switch (config) # ipv6 routing
Related Commands
Notes	When routing is enabled, the switch attempts to deliver inbound packets to destination addresses by forwarding them to interfaces or next hop addresses specified by the IPv6 routing table

ipv6 routing disable-discard-counter

	ipv6 routing disable-discard-counter no ipv6 routing disable-discard-counter Disables router discard counters. The no form of the command restores discard counters advancing.
Syntax Description	N/A
Default	Disabled
Configuration Mode	config
History	3.9.2100
Example	switch (config) # ipv6 routing disable-discard-counter
Related Commands
Notes	A reboot is required for the feature to take effect.

show ipv6 interfaces

	show ipv6 interfaces [{{ethernet <port> \| port-channel <port-channel> \| vlan <vlan-id>}}\| brief] Displays the status of specified routed interfaces that are configured for IPv6.
Syntax Description	ethernet <port>	Displays output pertaining to the specified Ethernet interface
	port-channel <port-channel>	Displays output pertaining to the specified LAG interface
	vlan <vlan-id>	Displays output pertaining to the specified VLAN interface
	brief	Shows basic IPv6 information regarding all IPv6 interfaces
Default	N/A
Configuration Mode	Any command mode
History	3.6.4110
Example
switch (config) # show ipv6 interface Vlan10 is Enabled , line protocol is UP IPv6 : Enabled Link-local address : fe80::f652:14ff:fe2d:9808 Global Unicast Addresses : 2001:db01::2 /64 Joined Group Addresses : ff02::1 ff02::2 ff02::1:ff2d:9808 MTU : 1500 bytes ICMP error messages limited to every milliseconds : 100 ICMP redirects : enabled ND DAD : enabled Number of DAD attempts : 1 ND reachable time (milliseconds) : 30000 ND advertised retransmit interval (milliseconds) : 0 ND router advertisements maximum interval (seconds) : 600 ND router advertisements minimum interval (seconds) : 198 ND router advertisements managed configuration flag : unset ND router advertisements other configuration flag : unset ND solicited router advertisement : suppressed ND router advertisements lifetime (seconds) : 1800 ND advertised default router preference : medium ND router advertisements hop-limit : 64
Related Commands
Notes

show ipv6 interfaces brief

	show ipv6 interfaces [<type> <id>] brief Displays basic IPv6 information regarding all IPv6 interfaces
Syntax Description	<type> <id>	Specifies the interface for which to display data
Default	N/A
Configuration Mode	Any command mode
History	3.6.4110
History	3.6.8008	Updated Example
Example
switch (config) # show ipv6 interface brief ------------------------------------------------------------------------------------------------------------- Interface Address/Mask Primary Address-state Admin-state Oper-state MTU VRF ------------------------------------------------------------------------------------------------------------- mgmt0 fe80::784e/64 valid Enabled Up 1500 default Eth1/1 2001::1/64 primary valid Enabled Down 1500 default Eth1/1 2002::1/64 valid
Related Commands
Notes

show interfaces null0

	show interfaces null0 [vrf <vrf-name>] Displays blackhole route byte and packet counters.
Syntax Description	N/A
Default	N/A
Configuration Mode	Any command mode
History	3.6.4110
Example	switch (config) # show interfaces null0 10 packets 740 bytes
Related Commands
Notes

show ipv6 neighbors

	show ipv6 neighbors [{ethernet <port> \| port-channel <port-channel> \| vlan <vlan-id>} \| <ipv6 address> \| summary] Displays IPv6 neighbor discovery (ND) cache information.
Syntax Description	ethernet <port>	Displays output pertaining to the specified Ethernet interface.
	vlan <vlan-id>	Displays output pertaining to the specified VLAN interface.
	ipv6 address	IPv6 address of individual neighbor
Default	N/A
Configuration Mode	Any command mode
History	3.4.1100
History	3.6.4110	Updated command syntax and Example
Example
switch (config) # show ipv6 neighbors IPv6 Address MAC Address State Interf ------------------------ ----------------- ---------- ------ 2001:db01::1 f4:52:14:2d:98:88 Reachable vlan10
Related Commands
Notes

show ipv6 route

	show ipv6 route [vrf <vrf-name] {[<ipv6-address> <ipv6-address>/<length> [longer-prefixes]] [connected \| bgp \| static]} Displays IPv6 neighbor discovery (ND) cache information.
Syntax Description	ipv6-addr	Filters routes by IPv6 address or prefix
	longer-prefixes	Displays output for longer prefix entries
	connected	Displays entries for routes to networks directly connected to the switch
	static	Displays entries added through CLI commands
	summary	Displays the current contents of the IPv6 routing table in summary format
Default	N/A
Configuration Mode	Any command mode
History	3.4.1100
	3.6.4110	Updated Example
	3.6.8008	Updated Example
Example
switch (config) # show ipv6 route Flags: F: Failed to install in H/W B: BFD protected i: BFD session initializing x: protecting BFD session failed VRF Name default: --------------------------------------------------------------------------- Destination Flag Gateway Interface Source AD/M --------------------------------------------------------------------------- fe80::/64 :: mgmt0 direct 256/256 default :: mgmt0 direct 1/1
Related Commands
Note

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