7/24/2018

Arista EOS - "ip virtual mac-address mlag-peer"

Say, in a mlag environment, 

  • The hosts can not understand the vMAC in the ARP packets. For example, some F5 and Netapp devices only check the srcMAC of ARP reply, instead of the srcHwMAC inside the ARP.
  • These host hashes the traffic with gateway's system mac to 2 mlag peers. 
  • When mlagPeer1 receives packets with dstMAC = mlagPeer2 system MAC, it should forward it to peer2 via peerlink, not good, a totally waste of peerlink
  • We can configure "ip virtual-router mac-address mlag-peer", which enables the peer to consume packets destined to peer and route them directly. 

psp111.14:56:21#sh platform trident l3  shadow my-station
My Station Tcam:
--------------------------------------------------------------------------------
Id    Vlan/Mask                                  Mac/Mask       VVVVMACD         T/       ModId/    IngPort/
                                                                4646PRPS       Mask         Mask        Mask
                                                                UUMMLPUC
                                                                CCCCS  D
7         0/0x0       44:4c:a8:93:22:9b/ff:ff:ff:ff:ff:ff       00000000        0/1        0/0x0      0/0x7f
8         0/0x0       44:4c:a8:93:22:9b/ff:ff:ff:ff:ff:ff       11001000        0/0        0/0x0       0/0x0
9         0/0x0       01:00:5e:00:00:00/ff:ff:ff:00:00:00       00000100        0/0        0/0x0       0/0x0
10        0/0x0       44:4c:a8:93:29:d5/ff:ff:ff:ff:ff:ff       11001100        0/0        0/0x0       0/0x0
11        0/0x0       00:dc:00:02:00:01/ff:ff:ff:ff:ff:ff       11001100        0/0        0/0x0       0/0x0

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