The MPLS-OPS Archive

[Abhishek Mittal <ask4mpls@yahoo.com>]

Hi Prabhu,

 

It seems some high latency during the ping response.Can u check the LL connectivity , is it ok or u r getting some drops ? This verification can be carried out from CE also.

 

Secondly , if LL is working fine , plz check the VRF config and routes once again.Many times I observed some packet drops from PE to CE , in the mean while no drops from CE to PE. that can be due to some mismatching of the serial interface parameters.

 

Once you shut and no shut this particular serial interface , this problem will solve.And you will able to ping PE-CE without any drops ( provided LL should be working fine).

 This problem can occur if u have BRI backup for the same. And when LL goes down it will switch over to BRI backup.And once LL will restore, it starts this problem.

 

At this moment , you have to check the backup idle timeout as well as u have to verify the basis commands for backup.Which resolves after shut and no shut the serial interface once again.

 

Regards

Abhishek Mittal

 

 

Prabhu <prabhu.s@tataisp.com> wrote:

Hi ,

 

I am new to MPLS techonology.....I am unable to ping the CE router from PE router .When i try to ping the CE i am getting

Intermittently drops....

 

CHNACR02#ping vrf ML_CHE x.x.x.x

 

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to x.x.x.x, timeout is 2 seconds:
...!!
Success rate is 40 percent (2/5), round-trip min/avg/max = 1504/1642/1780 ms
CHNACR02#ping vrf ML_CHE 203.124.216.98

 

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to x.x.x.x, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1108/1664/1936 ms
CHNACR02#ping vrf ML_CHE 203.124.216.98

 

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to x.x.x.x, timeout is 2 seconds:
..!!!
Success rate is 60 percent (3/5), round-trip min/avg/max = 1692/1758/1868 ms

 

CHNACR02#sh ip route vrf ML_CHE
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

 

Gateway of last resort is not set

 

     x.x.x..0/30 is subnetted, 1 subnets
C       x.x.x.x is directly connected, Serial3/1:11

 

CE -PE are configured through static routes....

 

Appreciate ur comments

 

regards

Prabhu
    

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