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How To Configure VRRP fabric routing to achieve active-active forwarding/routing on all VRRP routers

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TitleHow To Configure VRRP fabric routing to achieve active-active forwarding/routing on all VRRP routers
Objective
An example of VRRP fabric routing configuration to achieve active-active forwarding/routing on all VRRP routers
Environment
  • EXOS 16.2 and onwards
Procedure
Note: This article explains VRRP fabric routing configuration in the scenario where LAG or Teaming is not used on downstream devices. But, the configuration here also applies to the MLAG scenario.

VRRP Fabric Routing: Available in EXOS 16.2 and onwards 
  • Achieve "active-active" forwarding/routing on VRRP master/backup routers without the need to manage ACLs.
  • Allow VRRP backup routers to take part in L3 routing for the packets it receives with the destination address equal to VMAC.
  • Only VRRP master responds to an arp request to a VRRP VIP address. (no duplicate arp responses which is seen in VRRP active-active design)
Topology:

User-added image

Configurations:

@ SW1 (VRRP Master)

create vlan V107
configure vlan V107 tag 107
configure vlan V107 add ports 49 tagged  
configure vlan V107 add ports 1-4 untagged  
configure vlan V107 ipaddress 10.82.107.2 255.255.255.0
enable ipforwarding vlan V107

create vrrp vlan V107 vrid 1
configure vrrp vlan V107 vrid 1 priority 200
configure vrrp vlan V107 vrid 1 preempt delay 5
configure vrrp vlan V107 vrid 1 fabric-routing on
configure vrrp vlan V107 vrid 1 add 10.82.107.1
enable vrrp vlan V107 vrid 1

@ SW2 (VRRP Backup)

create vlan V107
configure vlan V107 tag 107
configure vlan V107 add ports 49 tagged  
configure vlan V107 add ports 1-4 untagged  
configure vlan V107 ipaddress 10.82.107.3 255.255.255.0
enable ipforwarding vlan V107

create vrrp vlan V107 vrid 1
configure vrrp vlan V107 vrid 1 fabric-routing on
configure vrrp vlan V107 vrid 1 add 10.82.107.1
enable vrrp vlan V107 vrid 1

 
Additional notes
The VRRP VMAC 00:00:5E:00:01:01 is installed for L3 routing on both master and backup VRRP routers (SW1 and SW2 in the above diagram).

SW1 # debug hal show fdb
ST-32Q SW FDB table:
Software-learned entries:
Buck Ent MAC               VlanId    Flags Port  HIT   L3    L2MC  Phantom
==========================================================================
x000 0/0 00:00:5e:00:01:01    107 00000009  CPU FALSE TRUE   N -1  N

SW2 # debug hal show fdb
ST-32Q SW FDB table:
Software-learned entries:
Buck Ent MAC               VlanId    Flags Port  HIT   L3    L2MC  Phantom
==========================================================================
x000 0/0 00:00:5e:00:01:01    107 00000009  CPU FALSE TRUE   N -1  N


VRRP Fabric Routing Limitations:
  • Fabric Routing feature will not be supported for VRRP instance for which Virtual IP is same as interface IP (owned IP).
  • Traffic sent from host destined for VIP, will be L3 forwarded by FREB (Fabric Routing Enabled Backup) router if FREB router sits in between, even though both are in same subnet.
  • PVLAN configuration will not be supported in this release.
  • VLAN Aggregation configuration will not be supported in this release.

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