Overview
Many data centers today are moving from legacy Layer 2 (L2) designs to modern Layer 3 (L3) web-scale IT architectures. L3 designs simplify troubleshooting, provide clear upgrade strategies, support multi-vendor environments, and dramatically reduce the size of failure domains.
General Data Center Network with EVPN
However, many applications and storage appliances still require layer 2 adjacency. VXLAN tunnels can satisfy this L2 adjacency requirement, and EVPN serves as a standard for scale-out L2 Ethernet fabrics. VXLAN can virtualize the data center network, enabling layer 2 segments to be extended over an IP core (the underlay). EVPN is the control plane for modern VXLAN deployments, allowing VTEPs to discover each other via EVPN and exchange reachability information such as MAC and IPs across racks.
ARP suppression is used to reduce the amount of broadcast packets crossing the extended L2 domain. BGP is the underlay routing protocol serving as the transport layer for the overlay VXLAN.
Example of How To Configure EVPN
The configuration flow will be described using the setup illustrated below and over leaf3.
Layer 2 Configuration, MLAG, and VLANs
MLAG between leaf3 and leaf4
lacp dcb priority-flow-control enable force protocol mlag interface port-channel 1 interface ethernet 1/1 channel-group 1 mode active interface port-channel 1 dcb priority-flow-control mode on force interface mlag-port-channel 7-8 no shutdown interface ethernet 1/31 mlag-channel-group 7 mode active interface ethernet 1/32 mlag-channel-group 8 mode active vlan 4094 ip routing vrf default interface vlan 4094 interface vlan 4094 ip address 10.10.10.1/30 primary interface vlan 4094 mtu 9216 mlag-vip mlag-pair-1 ip 192.168.1.1 /24 force interface port-channel 1 ipl 1 interface vlan 4094 ipl 1 peer-address 10.10.10.2 no mlag shutdown
Layer 2 Ports
In our setup we use VLAN 6 as the native VLAN, and VLAN 10 as the Tagged VLAN.
We use LACP Bond on our servers, and using them we set LACP on the Switch MPOs.
PXE boot is required to set our MPOs to "lacp-individual enable"
interface mlag-port-channel 7-8 interface ethernet 1/7 mlag-channel-group 7 mode active interface ethernet 1/8 mlag-channel-group 8 mode active interface mlag-port-channel 7-8 mtu 9216 force interface mlag-port-channel 7 switchport mode hybrid interface mlag-port-channel 8 switchport mode hybrid interface mlag-port-channel 7-8 no shutdown lacp interface mlag-port-channel 7-8 lacp-individual enable force vlan 6 vlan 10 interface mlag-port-channel 7 switchport access vlan 6 interface mlag-port-channel 8 switchport access vlan 6 interface mlag-port-channel 7 switchport hybrid allowed-vlan 10 interface mlag-port-channel 8 switchport hybrid allowed-vlan 10
Layer 3 Configuration
Layer 3 Interfaces
- Since we use VXLAN, we will set all of our L3 interfaces to support a maximum MTU of 9216. The servers' MTU should be set to below the maximum fabric MTU to allow space for the additional headers of the VXLAN. The VXLAN encapsulation header adds 50 bytes to the overall size of an Ethernet frame.
- Router ports serve as uplinks.
- Loopback for VTEP source is unique per leaf switch.
interface ethernet 1/28 no switchport force interface ethernet 1/29 no switchport force interface ethernet 1/28 mtu 9216 force interface ethernet 1/29 mtu 9216 force interface loopback 1 interface ethernet 1/28 ip address 100.100.100.1/30 primary interface ethernet 1/29 ip address 100.100.100.5/30 primary interface loopback 1 ip address 1.1.1.1/32 primary
VXLAN Tunnels Configuration
NVE represents a VTEP. We will use a single VTEP with multiple VNIs.
protocol nve interface nve 1 interface nve 1 vxlan source interface loopback 1 interface nve 1 nve controller bgp interface nve 1 vxlan mlag-tunnel-ip 100.0.0.1 interface nve 1 nve vni 10010 vlan 10 interface nve 1 nve vni 10060 vlan 6
Note that "vxlan mlag-tunnel-ip" is used to configure MLAG with VXLAN. This way other VTEPs will see the MLAG pair as a single entity (for this reason, the "mlag-tunnel-ip" setting should be unique per MLAG pair). As long as the MLAG is up, both switches will use the same IP as the VTEP source. If MLAG state changes to Split Brain (IPL is down but mgmt0 interface is up), the standby switch will use its local loopback for the advertisements; this will prevent impacting traffic from stand-alone ports by the Split Brain scenario.
The only command needed to add more VNIs to a switch is:
interface nve 1 nve vni 10020 vlan 20
ARP Suppression
Traditional L2 network broadcast traffic generated by ARP requests overloads the network. Using ARP suppression with VXLAN enables suppressing these messages at the leaf layer. Let's consider the example setup that is illustrated below.
The support for gratuitous ARP in EVPN has been added, also when ARP Suppression is enabled. The feature allows generating GARP packets on the egress VTEP only when neighbor-suppression is enabled on both VTEPs in the chain (ingress and egress). The suppression should be enabled on interface NVE or on a particular VLAN of the VTEP.
- The first time Server2 communicates, it sends an ARP request.
- Leaf2 learns its MAC and IP, and sends an EVPN update containing the IP and MAC on the corresponding VNI4010.
- Leaf1 learns the IP and MAC of Server2 on VNI4010.
- When Server1 sends an ARP request to Server2, leaf1 replies to the ARP request as it has all of the details.
- The result is that broadcasts to all leafs that are part of VNI4010 are suppressed.
interface nve 1 nve neigh-suppression interface vlan 6 interface vlan 10
EVPN Neighbor-Suppression
EVPN neighbor-suppression | ||
|---|---|---|
enabled | disabled | |
IPv4 Normal ARP | suppressed | flooded |
IPv4 GARP | suppressed* | flooded |
IPv6 Neighbor Discovery (equivalent to IPv4 ARP) | suppressed | flooded |
IPv6 Unsolicited Neighbor Advertisement (equivalent to IPv4 GARP) | flooded | flooded |
* the GARP (Gratuitous ARP) packet will reach the destination endpoint despite neighbor suppression
Since IPv4 GARP is processed locally on ingress VTEP and then only BGP update propagated through EVPN network there are several limitations related to scale and performance. The following limitations vary based on the CPU type and current switch load. Switches with higher performance will have better results. Below are the minimum performance expected.
- Ingress VTEP: max 1000 frames per second of ingress GARP
- Egress VTEP: at least 100 fps for GARP generation
BGP and EVPN Configuration
The examples below use eBGP. Nevertheless, iBGP can be used as well.
Now we will configure our L3 underlay using eBGP as the underlay protocol. The Autonomous System (AS) design that we use as an example represents common designs of eBGP running over leaf/spine data centers. Specifically, each of the leaf switches will be in a separate AS, and the spine layer will be in the same AS layer.
BGP
protocol bgp router bgp 65001 vrf default router bgp 65001 vrf default bgp fast-external-fallover router bgp 65001 vrf default maximum-paths 32 router bgp 65001 vrf default bestpath as-path multipath-relax force router bgp 65001 vrf default neighbor 10.10.10.2 remote-as 65002 router bgp 65001 vrf default neighbor 100.100.100.1 remote-as 65000 router bgp 65001 vrf default neighbor 100.100.100.5 remote-as 65000 router bgp 65001 vrf default network 1.1.1.1 /32 router bgp 65001 vrf default network 100.0.0.1 /32
Note: It is necessary to advertise both the local loopback network and the mlag-tunnel-ip network.
EVPN Address Family
In the following code, we create a peer group that contains all of the EVPN configuration and attach it to our L3 interfaces.
router bgp 65001 vrf default neighbor evpn peer-group router bgp 65001 vrf default neighbor evpn send-community router bgp 65001 vrf default neighbor evpn send-community extended router bgp 65001 vrf default address-family l2vpn-evpn neighbor evpn next-hop-unchanged router bgp 65001 vrf default address-family l2vpn-evpn neighbor evpn activate router bgp 65001 vrf default address-family l2vpn-evpn vni auto-create router bgp 65001 vrf default neighbor 10.10.10.1 peer-group evpn router bgp 65001 vrf default neighbor 100.100.100.1 peer-group evpn router bgp 65001 vrf default neighbor 100.100.100.5 peer-group evpn
Spine Configuration
Each spine has a unique loopback address that we use to represent its Router-ID.
ip routing vrf default interface ethernet 1/1-1/4 no switchport force interface ethernet 1/1-1/4 mtu 9216 force interface loopback 1 interface ethernet 1/1 ip address 100.100.100.2/30 primary interface ethernet 1/2 ip address 100.100.100.6/30 primary interface ethernet 1/3 ip address 100.100.100.10/30 primary interface ethernet 1/4 ip address 100.100.100.14/30 primary interface loopback 1 ip address 1.1.1.5/32 primary
protocol bgp router bgp 65000 vrf default router bgp 65000 vrf default bgp fast-external-fallover router bgp 65000 vrf default maximum-paths 32 router bgp 65000 vrf default bestpath as-path multipath-relax force router bgp 65000 vrf default neighbor 100.100.100.1 remote-as 65001 router bgp 65000 vrf default neighbor 100.100.100.5 remote-as 65002 router bgp 65000 vrf default neighbor 100.100.100.9 remote-as 65003 router bgp 65000 vrf default neighbor 100.100.100.13 remote-as 65004 router bgp 65000 vrf default neighbor evpn peer-group router bgp 65000 vrf default neighbor evpn send-community router bgp 65000 vrf default neighbor evpn send-community extended router bgp 65000 vrf default address-family l2vpn-evpn neighbor evpn next-hop-unchanged router bgp 65000 vrf default address-family l2vpn-evpn neighbor evpn activate router bgp 65000 vrf default neighbor 100.100.100.1 peer-group evpn router bgp 65000 vrf default neighbor 100.100.100.5 peer-group evpn router bgp 65000 vrf default neighbor 100.100.100.9 peer-group evpn router bgp 65000 vrf default neighbor 100.100.100.13 peer-group evpn router bgp 65000 vrf default network 1.1.1.5 /32
Traffic Behavior During Failures
Server Link Failure
Traffic forwarding during a failure follows standard MLAG behavior. If a link of the server fails, traffic will be forwarded across one of the remaining active links.
With reference to the illustration below: If traffic is received on leaf3 due to the ECMP hash of the spine, leaf3 will decapsulate the frame. And based on its local MAC table, leaf3 will also switch the frame across the peer link for forwarding to Server via leaf4.
Uplink Failure
To cover rare cases such as losing all of the uplinks on one of the MLAG peers, we enable BGP over the IPL. This way, traffic coming from the servers towards that leaf can still be routed towards the remote servers.
Note: Traffic coming towards the servers connected to leaf4 from the spine will always be terminated on leaf4 and sent directly to the servers without passing over the IPL.
EVPN Troubleshooting
show interface nve 1
Display the configured VTEP on a network device participating in BGP EVPN.
Interface NVE 1 status:
Admin state : Enabled
Source interface : loopback 1
Source interface ip : 4.4.4.4
Controller mode : BGP
MLAG tunnel ip : 8.8.8.8
Effective tunnel ip : 8.8.8.8
Global neigh-suppression: Disabled
Auto-vlan-map : Enabled
Auto-vlan-map base : 100000
Counters:
encapsulated (Tx) NVE packets : 0
decapsulated (Rx) NVE packets : 0
dropped NVE-encapsulated packets : 0
NVE-encapsulated packets with errors: 0
show interface nve 1 detail
Display the configured VNIs on a network device participating in BGP EVPN.
Admin state : Enabled Source interface : loopback 1 Source interface ip : 4.4.4.4 Controller mode : BGP MLAG tunnel ip : 8.8.8.8 Effective tunnel ip : 8.8.8.8 Global neigh-suppression: Disabled Auto-vlan-map : Enabled Auto-vlan-map base : 100000 -------------------------------------------------------------- Vlan VNI Neigh Suppression Mapping type -------------------------------------------------------------- 1 100001 Disabled Auto 10 10 Disabled Manual 20 20 Disabled Manual 30 30 Disabled Manual 4000 Excluded N/A N/A
show ip bgp evpn summary
Display the BGP peers participating in the layer 2 EVPN address-family and their states.
VRF name : default BGP router identifier : 1.1.1.1 local AS number : 101 BGP table version : 2176 Main routing table version: 2176 IPV4 Prefixes : 12 IPV6 Prefixes : 0 L2VPN EVPN Prefixes : 9 ------------------------------------------------------------------------------------------------------------------ Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd ------------------------------------------------------------------------------------------------------------------ 10.10.10.2 4 102 2320 2539 2176 0 0 0:00:46:52 ESTABLISHED/5 192.168.14.4 4 104 2112 3159 2176 0 0 0:00:57:56 ESTABLISHED/4
show ip bgp evpn
Display all EVPN routes, both local and remote. The routes displayed here are based on RD as they are across VNIs.
show ip bgp evpn ------------------------------------------------------------------------------------------------------------------------------------ RD Type Data Next Hop Metric LocPrf Weight Path ------------------------------------------------------------------------------------------------------------------------------------ 1.1.1.1:10 mac-ip 00:00:01:11:22:33 1.1.1.1 0 100 0 104 101 ? 9.9.9.9:30 mac-ip 00:10:94:00:00:02 9.9.9.9 0 100 0 104 102 ? 9.9.9.9:30 mac-ip 00:10:94:00:00:03 9.9.9.9 0 100 0 104 102 ? 1.1.1.1:10 imet 1.1.1.1 1.1.1.1 0 100 0 104 101 ? 3.3.3.3:10 imet 3.3.3.3 3.3.3.3 0 100 0 ? 3.3.3.3:30 imet 3.3.3.3 3.3.3.3 0 100 0 ? 3.3.3.3:123 imet 3.3.3.3 3.3.3.3 0 100 0 ? 9.9.9.9:10 imet 9.9.9.9 9.9.9.9 0 100 0 104 102 ? 9.9.9.9:30 imet 9.9.9.9 9.9.9.9 0 100 0 104 102 ?
show ip bgp evpn vni 10060
Display the EVPN information for a specific VNI in detail.
show ip bgp evpn vni 10060 ---------------------------------------------------------------------------------------------------------------------------------------------- RD Type Data Next Hop Metric LocPrf Weight Path ---------------------------------------------------------------------------------------------------------------------------------------------- 1.1.1.1:321 mac-ip 00:00:01:11:22:33 1.1.1.1 0 100 0 104 101 ? 1.1.1.1:321 mac-ip 00:10:00:00:00:05 1.1.1.1 0 100 0 104 101 ? 1.1.1.1:321 mac-ip 00:10:33:01:7d:2a 1.1.1.1 0 100 0 104 101 ? 1.1.1.1:321 mac-ip 00:10:66:02:fa:54 1.1.1.1 0 100 0 104 101 ? 1.1.1.1:321 mac-ip 00:10:88:06:a7:33 1.1.1.1 0 100 0 104 101 ? 1.1.1.1:321 mac-ip 00:10:cc:05:f4:a8 1.1.1.1 0 100 0 104 101 ? 9.9.9.9:321 mac-ip 00:10:94:00:00:02 9.9.9.9 0 100 0 104 102 ? 9.9.9.9:321 mac-ip 00:10:94:00:00:03 9.9.9.9 0 100 0 104 102 ?
show ip bgp evpn with multiple filters
Display the EVPN information for a specific VNI in detail, selecting different filters
switch (config) # show ip bgp evpn vni 1000 route-type mac-ip
---------------------------------------------------------------------------------------------------------------------------------------
RD Type Data Next Hop Metric LocPrf Weight Path
---------------------------------------------------------------------------------------------------------------------------------------
2.3.4.5:5 mac-ip 00:bb:cc:dd:ee:ff 2.3.4.5 0 100 0 ?
switch (config) # show ip bgp evpn vni 1000 route-type mac-ip detail
1 paths for mac-ip 00:bb:cc:dd:ee:ff Route Distinguisher: 2.3.4.5:5:
route:
next hop : 2.3.4.5
neighbor ip : 1.1.1.2
router id : 2.3.4.5
metric : 0
weight : 0
local pref : 100
origin : incomplete
Extended Community: 100:268436456(Route-Target-AS)
Extended Community: tunnelTypeVxlan(TunnelEncap)
flags : valid, best
esi : 00:00:00:00:00:00:00:00:00:00
vni : 1000
path :
ethernet tag id :
show mac-address-table
Display all local and remote MAC addresses.
----------------------------------------------------------- Vlan Mac Address Type Port\Next Hop ----------------------------------------------------------- 10 00:00:01:11:22:33 Static 9.9.9.9(nve1) 10 00:00:01:55:A4:25 Static 1.1.1.1(nve1) 10 00:10:00:00:0A:67 Dynamic Eth1/10 10 00:10:44:03:51:01 Dynamic Eth1/10 10 00:10:88:06:A2:02 Dynamic Eth1/10 10 00:10:AA:07:0F:B1 Dynamic Eth1/10 30 00:10:00:00:05:29 Dynamic 1.1.1.1(nve1) 30 00:10:00:00:0A:52 Dynamic 1.1.1.1(nve1) 123 00:10:00:00:0A:5B Dynamic 9.9.9.9(nve1) 123 00:10:44:03:51:0E Dynamic 9.9.9.9(nve1) 123 00:10:88:06:A2:1C Dynamic 9.9.9.9(nve1) Number of unicast(local): 4 Number of NVE: 7
show ip arp
Display all local and remote neighbors (ARP entries), this command is only relevant when arp-suppression is enabled.
VRF Name default: Total number of entries: 13 ------------------------------------------------------------------------------ Address Type Hardware Address Interface ------------------------------------------------------------------------------ 10.209.20.1 Dynamic ETH 00:00:5E:00:01:01 mgmt0 10.209.20.57 Dynamic ETH 90:B1:1C:04:11:8D mgmt0 10.209.20.58 Dynamic ETH 90:B1:1C:04:11:C1 mgmt0 10.209.20.67 Dynamic ETH 90:B1:1C:03:57:09 mgmt0 151.151.10.1 Dynamic ETH 98:03:9B:A2:BF:80 mgmt0 136.6.166.105 Dynamic ETH 00:00:66:02:FB:0C vlan 10 136.6.162.102 Dynamic EVPN 00:00:00:00:05:58 vlan 123 136.6.162.114 Dynamic EVPN 00:00:01:00:00:02 vlan 123 172.3.12.4 Static EVPN 00:11:22:33:44:55 vlan 123 136.6.165.153 Dynamic EVPN 00:00:44:03:51:30 vlan 30 136.6.166.99 Dynamic EVPN 00:00:01:00:00:02 vlan 30 204.5.245.253 Dynamic EVPN 00:00:22:01:A8:98 vlan 30 192.168.34.4 Dynamic ETH 24:8A:07:F4:FF:48 eth 1/15
EVPN Data Center Interconnect (DCI)
Layer 2 DCI Connection
Regular BGP/EVPN Configuration is required since the connection between the sites is L2 based.
Layer 3 Routes WAN
As the WAN transport layer does not support the EVPN/BGP address family, a remote BGP/EVPN connection should be set between each of the local leafs and the remote leafs. To allow this connection BGP should be set to multi-hop mode.
router bgp 65004 neighbor 100.100.100.5 ebgp-multihop 254
EVPN Centralized L3 Gateway
In centralized L3 gateway, a specific VTEP can be configured to act as the default gateway for all the hosts in a particular subnet throughout the EVPN network. It is possible to provision an MLAG pair in active-active mode as the default gateway. The VTEP will perform a routing to the destination host together with VxLAN ingress and egress bridging.
Configuration Example of EVPN Centralized Gateway
Run the following:
ip routing vrf default protocol nve interface nve 1 interface nve 1 vxlan source interface loopback 1 interface nve 1 nve controller bgp interface nve 1 nve vni auto-vlan-map base 100000
The underlay
protocol bgp router bgp 1 vrf default router bgp 1 vrf default router-id 200.0.1.1 force router bgp 1 vrf default neighbor 1.1.1.2 remote-as 1 router bgp 1 vrf default address-family l2vpn-evpn neighbor 1.1.1.2 send-community router bgp 1 vrf default address-family l2vpn-evpn neighbor 1.1.1.2 send-community extended router bgp 1 vrf default address-family l2vpn-evpn neighbor 1.1.1.2 next-hop-unchanged router bgp 1 vrf default address-family l2vpn-evpn neighbor 1.1.1.2 activate router bgp 1 vrf default redistribute connected router bgp 1 vrf default address-family l2vpn-evpn vni auto-create
The overlay
vlan 10 interface vlan 10 ip address 192.168.1.1 /24
VTEP Key Outputs
VTEP1 switch (config) # show ip bgp evpn detail
1 paths for mac-ip b8:59:9f:a7:0f:88 192.168.1.1 Route Distinguisher: 200.0.1.1:10:
route:
next hop : 1.1.1.1
neighbor ip : 2.2.2.2
router id : 200.0.2.1
metric : 0
weight : 0
local pref : 100
origin : incomplete
Extended Community: 1:269205466(Route-Target-AS)
Extended Community: tunnelTypeVxlan(TunnelEncap)
Extended Community: defaultGateway
flags : valid, best
esi : 00:00:00:00:00:00:00:00:00:00
vni : 100010
path : 1
ethernet tag : 0
VTEP1 switch (config) # show ip arp
Flags:
G: EVPN Default GW
VRF Name default:
Total number of entries: 2
-----------------------------------------------------------------------------------------------
Address Type Flags Hardware Address Interface
-----------------------------------------------------------------------------------------------
192.168.1.1 Dynamic EVPN G B8:59:9F:A7:0F:88 vlan 10
Configuration Example of MLAG EVPN Centralized Gateway
Configure the MLAG Master in the following way
ip routing vrf default protocol nve interface nve 1 interface nve 1 vxlan source interface loopback 1 interface nve 1 nve controller bgp interface nve 1 vxlan mlag-tunnel-ip 5.5.5.5 interface nve 1 nve vni auto-vlan-map base 100000 interface mlag-port-channel 1 switchport access vlan 10 interface vlan 10 ip address 10.0.0.251/24 primary interface vlan 4094 ip address 2.2.2.1/24 primary protocol magp interface vlan 10 magp 10 interface vlan 10 magp 10 ip virtual-router address 10.0.0.1 interface vlan 10 magp 10 ip virtual-router mac-address 00:00:5e:00:00:10 mlag-vip MLAG-1 ip 11.11.11.11 /24 force interface port-channel 1 ipl 1 interface vlan 4094 ipl 1 peer-address 2.2.2.2 protocol bgp router bgp 1 vrf default router bgp 1 router-id 200.0.0.1 force router bgp 1 neighbor 1.1.1.2 remote-as 1 router bgp 1 neighbor 2.2.2.2 remote-as 1 router bgp 1 address-family l2vpn-evpn neighbor 1.1.1.2 send-community router bgp 1 address-family l2vpn-evpn neighbor 2.2.2.2 send-community router bgp 1 address-family l2vpn-evpn neighbor 1.1.1.2 send-community ext router bgp 1 address-family l2vpn-evpn neighbor 2.2.2.2 send-community ext router bgp 1 address-family l2vpn-evpn neighbor 1.1.1.2 next-hop-unchanged router bgp 1 address-family l2vpn-evpn neighbor 2.2.2.2 next-hop-unchanged router bgp 1 redistribute connected router bgp 1 address-family l2vpn-evpn vni auto-create
Configure the MLAG Standby in the following way:
ip routing vrf default protocol nve interface nve 1 interface nve 1 vxlan source interface loopback 1 interface nve 1 nve controller bgp interface nve 1 vxlan mlag-tunnel-ip 5.5.5.5 interface nve 1 nve vni auto-vlan-map base 100000 interface mlag-port-channel 1 switchport access vlan 10 interface vlan 10 ip address 10.0.0.252/24 primary interface vlan 4094 ip address 2.2.2.2/24 primary protocol magp interface vlan 10 magp 10 interface vlan 10 magp 10 ip virtual-router address 10.0.0.1 interface vlan 10 magp 10 ip virtual-router mac-address 00:00:5e:00:00:10 mlag-vip MLAG-1 ip 11.11.11.11 /24 force interface port-channel 1 ipl 1 interface vlan 4094 ipl 1 peer-address 2.2.2.1 protocol bgp router bgp 1 vrf default router bgp 1 router-id 200.0.1.1 force router bgp 1 neighbor 1.1.1.2 remote-as 1 router bgp 1 neighbor 2.2.2.1 remote-as 1 router bgp 1 address-family l2vpn-evpn neighbor 1.1.1.2 send-community router bgp 1 address-family l2vpn-evpn neighbor 2.2.2.1 send-community router bgp 1 address-family l2vpn-evpn neighbor 1.1.1.2 send-community ext router bgp 1 address-family l2vpn-evpn neighbor 2.2.2.1 send-community ext router bgp 1 address-family l2vpn-evpn neighbor 1.1.1.2 next-hop-unchanged router bgp 1 address-family l2vpn-evpn neighbor 2.2.2.1 next-hop-unchanged router bgp 1 redistribute connected router bgp 1 address-family l2vpn-evpn vni auto-create
EVPN Logging Examples
EVPN MAC Mobility Logs
MAC mobility warning is detected when a MAC address is noticed to move between a local and one or more remote customer site 5 times in a period of 180 seconds. This indicates that multiple hosts have been configured with the same MAC address. The MAC mobility warning is cleared when only one route for the MAC address is left (either local or remote).
When detecting EVPN MAC duplication, the following message will appear:
[metad.WARNING]: EVPN MAC duplication detected for MAC 24:8A:07:A0:B0:0D, IP 2.2.2.2 and VLAN 6 from BGP neighbor 1.1.1.1
A static MAC error is detected when a remote route is received for a MAC address for which a local existing route has been marked as static. The local route being marked as static indicates that the MAC address is not expected to move. In this case, any remote route with this MAC address is an error. The static MAC error is cleared when all remote routes for the MAC address are withdrawn or if the local route is no longer marked as static.
When receiving EVPN MAC mobility route for a static MAC address, the following message will appear:
[metad.WARNING]: EVPN MAC mobility route received for sticky MAC 24:8A:07:A0:B0:0D, IP 2.2.2.2 and VLAN 6 from BGP neighbor 1.1.1.1
