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NCS - EVPN-IRB Limited to single MAC for ALL BVIs?!

80211WiGuy
Level 1
Level 1

Hello, I'm seeking clarification on the following note from the EVPN-IRB Configuration Guide.

"Only a single custom MAC address is supported for all BVIs across the system."
-Second note down the first page
https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5500/vpn/75x/b-l2vpn-cg-ncs5500-75x/configure-evpn-irb.html#concept_ftz_by4_wfb

At face value, it sounds like only a single MAC can be used for all BVIs used in EVPN-EVIs across one router/NCS - which would also imply that you would have to use that same MAC across ALL routers in your MPLS network because if you ever run into another router participating in separate EVIs that was using a different MAC address, then you would have a conflict when trying to establish an EVPN-IRB instance across the existing router and new router which happened to be deployed with a different MAC for IRB.

I'm hoping this is just poor wording and whats really meant is that you must use the same MAC on all BVIs participating within the same EVI across each participating router.  Separate EVI on the same router can use a different MAC address on another BVI.  The "system" noted in the reference quote is a single EVI.

Will this work?
NCS-A
EVI101
BVI-MAC-IP 101-0000.0000.0001-192.168.0.1
EVI201
BVI-MAC-IP 201-0000.0000.0002-192.168.2.1

NCS-B
EVI101
BVI-MAC-IP 101-0000.0000.0001-192.168.0.1

NCS-C
EVI201
BVI-MAC-IP 201-0000.0000.0002-192.168.2.1
1 Accepted Solution

Accepted Solutions

80211WiGuy
Level 1
Level 1

Just updating this thread to confirm that the statement about "system" is in reference to a single EVI, not an entire router.  All BVIs on a router can have their own unique custom MAC as long as they're all assigned to different EVIs.  This was confirmed with TAC.

View solution in original post

1 Reply 1

80211WiGuy
Level 1
Level 1

Just updating this thread to confirm that the statement about "system" is in reference to a single EVI, not an entire router.  All BVIs on a router can have their own unique custom MAC as long as they're all assigned to different EVIs.  This was confirmed with TAC.

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