Re: [c-nsp] Cisco 7600 pseudowire ping

Ivan Tue, 22 Jul 2014 03:21:30 -0700

Interesting enough regular mpls ping has no issue:

PE1#ping mpls ipv4 172.16.14.1/32 repeat 100
Sending 100, 100-byte MPLS Echos to 172.16.14.1/32,
     timeout is 2 seconds, send interval is 0 msec:


Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface,
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no label entry,
  'P' - no rx intf label prot, 'p' - premature termination of LSP,
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (100/100), round-trip min/avg/max = 1/2/4 ms

PE1#ping mpls pseudowire 172.16.14.1 440 repeat 100
Sending 100, 100-byte MPLS Echos to 172.16.14.1,
     timeout is 2 seconds, send interval is 0 msec:

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface,
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no label entry,
  'P' - no rx intf label prot, 'p' - premature termination of LSP,
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.
!!!!!!!!!!!!!!.!!!!!!!!!!!!!.!!!!!!!!!!!!!!.!!!!!!!!!!!!!!.!!!!!!!!!!!
!!!.!!!!!!!!!!!!!.!!!!!!!!!!!!
Success rate is 94 percent (94/100), round-trip min/avg/max = 1/2/4 ms
PE1#

And the rate-limit output on the destination:

PE2#show mls rate-limit | in Rate|On|UCAST
   Rate Limiter Type       Status     Packets/s   Burst  Sharing
        MCAST DFLT ADJ   On              100000     100  Not sharing
          ACL VACL LOG   On                2000       1  Not sharing
      MCAST PARTIAL SC   On              100000     100  Not sharing
        IP RPF FAILURE   On                 100      10  Group:0 S
           TTL FAILURE   On                  97      10  Not sharing
 ICMP UNREAC. NO-ROUTE   On                 100      10  Group:0 S
 ICMP UNREAC. ACL-DROP   On                 100      10  Group:0 S
           MTU FAILURE   On                 997      10  Not sharing
       UCAST IP OPTION   Off                  -       -     -
             IP ERRORS   On                 100      10  Group:0 S

As mentioned before we are only seeing this on devices where we arerunning 15.2(4)S4a


Thanks

Ivan

On 21/Jul/2014 7:56 p.m., Vitkovský Adam wrote:

And how about the regular mpls ping does that perform right?

I'd check the rate limiters:

show mls rate-limit
and look for UCAST IP OPTION -is it ON or OFF
though it should be off by default

adam

-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-boun...@puck.nether.net] On Behalf Of
Ivan
Sent: Sunday, July 20, 2014 12:58 AM
To: Peter Persson
Cc: cisco-nsp
Subject: Re: [c-nsp] Cisco 7600 pseudowire ping

No CoPP. Direct ping is fine.  Just the PW ping having issues.

On 20/Jul/2014 2:13 a.m., Peter Persson wrote:

Do you have any Control-plane policing?
As i understand your email, you are pinging between two 7600's
directly and not anything behind it?




2014-07-19 13:47 GMT+02:00 Ivan <cisco-...@itpro.co.nz
<mailto:cisco-...@itpro.co.nz>>:

     I have found that mpls pseudowire pings to some 7600s running
     15.2(4)S4a go missing - I see about 95/100 success rate.  On other
     devices with older software I have no loss.  The problem is not seen
     if the ping interval is increased to 100ms.  Also pinging over the
     VC shows no loss.

     Given the above I suspect some rate-limiting may be taking place.  I
     am hoping someone will be able to confirm and ideally share some
     commands that show come counters for the drops as so far I have had
     no success.

     c7600s72033-advipservicesk9-__mz.152-4.S4a.bin
     WS-X6704-10GE
     WS-SUP720-3BXL

     Thanks

     Ivan
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Re: [c-nsp] Cisco 7600 pseudowire ping

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