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Beginner

NCS 540 - BVI problème

Hello,
I am testing the NCS 540 for changed all ME-3800.
I try to configure BVI as the documentation but it seems doesn't work properly.

 

PC-A in vlan 6  >>>---------<2960-vlan6 >--------------<NCS 540 - sub interface + BVI configured >------MPLS Network <PC-B>

 

 

My configurationin NCS 540 :

 

interface GigabitEthernet0/0/0/20.6 l2transport
encapsulation dot1q 6 exact
!
interface BVI6
vrf vrf_nm
ipv4 address 10.159.15.254 255.255.255.0
!
l2vpn bridge group 6 bridge-domain 6 interface GigabitEthernet0/0/0/20.6 ! routed interface BVI6

 

My problèm:

  • I can see arp table in NCS 540
  • Ping between PC-A  ----> vlan 6 2960 is OK
  • Ping between PC-A  ----> BVI6 Is  not Ok
  • Ping PC-B  ------> BVI6 is oK
  • Ping vlan6-2960 ------> BVI-6 NCS 540  is not Ok

But on PC-A, I can see ping from NCS540 !! but my PC don't resolve ip via ARP requestre

 

It seems  a big problem in NCS 540 with broscast ARP.

 

When I configure static arp in 2960 : ping is ok

 

sw-site-test(config)#arp 10.159.15.254 d46a.357a.60da arpa
sw-site-test(config)#exit
sw-site-test#
sw-site-test#p
Dec 26 11:09:49: %SYS-5-CONFIG_I: Configured from console by admin on consoleing 10.159.15.69
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.159.15.69, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/4/14 ms
sw-site-test#
1 REPLY 1
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Hall of Fame Master

Hello @a.auvinet ,

your router is running IOS XR, the configuration is hierarchical, the router may default to use EVPN.

 

see EVPN IRB chapter in NCS 540 in following configuration guide

 

https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5xx/l2vpn/70x/b-l2vpn-cg-70x-ncs540.pdf

 

Your configuration should work for a VPLS with BUM automatically flooded (Broadcast, Unknown unicast, Multicast Traffic ) carried to all other PE nodes over p2p pseudowires with Martini encapsulation.

 

see pag 207 Configuration of EVPN IRB

BUM is not automatically flooded in EVPN as it was in VPLS of any form this explains what you see and why you need

a static ARP entry to be able to ping the BVI.

please note that EVPN requires the use of MP iBGP follow all the configurations templates.

 

 

Hope to help

Giuseppe