PING ISP IP whilst PW/AC being UP (ASR 9K)

alkhan.c · ‎11-08-2016

Hello,

I tried searching but couldn't find any solution regarding this, so I'll explain a little.

I have an ASR9K series router setup to act as a PE device and on the other side is a JUNIPER ROUTER (let's say ISP)

The ISP has given us 94.x.x.x/31 IP and I want to PING the gateway from their side without making the AC/PW down. As I want to ping them using l2 transport.

On Cisco 7600 series, below is how I used to ping without removing the xconnect:

interface Vlan2124

ip add 94.1.1.2 255.255.255.254 <<<<<<<< 94.1.1.2 is the IP given to us by ISP and we will ping 94.1.1.1 to check reachability without making MPLS DOWN
xconnect 192.168.182.204 13501600 encapsulation mpls
end

I need to achieve the same on ASR9K, but even if I create a routed interface BVI, it breaks the PW connection.

On ASR9K, my configuration is through bridge-domain and even if I create XCONNECT group, it is always in DOWN state.

Can someone guide me to the correct path?

My ASR9K version is 4.3.4

Thanks in advance!

Aleksandar Vidakovic · ‎11-08-2016

Which release are you using? Our suggestion is to use the best EMR available at this point in time: XR release 5.3.4.

Your minimum configuration should be along these lines (Control word is optional, but highly recommended). I've excluded here the attachment circuit to show that this works even without an AC.

interface BVI22
 ipv4 address 172.30.22.5 255.255.255.0
!
l2vpn
 bridge group av1
  bridge-domain av1
   neighbor 172.16.255.2 pw-id 100022
    pw-class CW
   !
   routed interface BVI22
  !
 !
!
 pw-class CW
  encapsulation mpls
   control-word
   load-balancing
    flow-label both
   !
  !
 !
!

PW is up and ping works:

RP/0/RSP0/CPU0:our9001#sh l2vpn bridge-domain bd-name av1
Tue Nov  8 14:54:38.539 CET
Legend: pp = Partially Programmed.
Bridge group: av1, bridge-domain: av1, id: 0, state: up, ShgId: 0, MSTi: 0
  Aging: 300 s, MAC limit: 4000, Action: none, Notification: syslog
  Filter MAC addresses: 0
  ACs: 1 (1 up), VFIs: 0, PWs: 1 (1 up), PBBs: 0 (0 up)
  List of ACs:
    BV22, state: up, BVI MAC addresses: 2
  List of Access PWs:
      Neighbor 172.16.255.2 pw-id 100022, state: up, Static MAC addresses: 0
  List of VFIs:
RP/0/RSP0/CPU0:our9001#

RP/0/RSP0/CPU0:our9001#ping 172.30.22.1
Tue Nov  8 14:54:24.750 CET
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.30.22.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/20 ms
RP/0/RSP0/CPU0:our9001#

alkhan.c · ‎11-08-2016

Sadly I'm using 4.3.4 version and I tried this way as well but sadly removing both BVI and PW is DOWN.