Multilink is up but not pinging

kumar94437 · ‎03-09-2010

Sir, we have cisco 7206 router.In that sometimes multilink is showing up like Multilink1 is up, line protocol is up.but it will not ping.After giving shutdown and no shutdown found pinging.What may be the problem.either configuration problem or link problem.

Multilink12, bundle name is MSCRTR-CDP
Bundle up for 1d02h
13 lost fragments, 356686 reordered, 0 unassigned
0 discarded, 0 lost received, 1/255 load
0x1519AA received sequence, 0xDD690 sent sequence
Member links: 2 active, 0 inactive (max not set, min not set)
Serial3/3:0, since 04:06:40, last rcvd seq 1519A8
Serial5/1:0, since 02:40:47, last rcvd seq 1519A9

interface Serial3/3:0
description CDP MSC-01
no ip address
encapsulation ppp
no fair-queue
ppp multilink
multilink-group 1

interface Serial5/1:0
no ip address
encapsulation ppp
no fair-queue
ppp multilink
multilink-group 12

sh version output is

Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (C7200-IS-M), Version 12.2(6c), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Sat 02-Feb-02 10:38 by pwade
Image text-base: 0x600089C0, data-base: 0x61390000

ROM: System Bootstrap, Version 12.2(4r)B, RELEASE SOFTWARE (fc1)
BOOTLDR: 7200 Software (C7200-KBOOT-M), Version 12.1(8a)E, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

ROUTER> uptime is 2 weeks, 4 days, 37 minutes
System returned to ROM by bus error at PC 0x6069D74C, address 0x3201C0 at 15:26:20 GMT Fri Feb 19 2010
System restarted at 12:39:44 GMT Sat Feb 20 2010
System image file is "disk1:c7200-is-mz.122-6c.bin"

Thanks and Regards,

Senthil

Giuseppe Larosa · ‎03-10-2010

Hello Senthil,

what is on the other side of the multilink?

with shut/no shut you have restarted the PPP multilink state machine.

serial interfaces and ATM interfaces when pinged send out a real frame on wire to device on the other end of the link.

So if ping is not successful it can be a problem on the other side not able to send back the frame that carries the ICMP packet inside.

You should have seen what was the state on the other device before performing the sh/no sh

Hope to help

Giuseppe

kumar94437 · ‎03-10-2010

Sir,Other side also both are up sir,Not only pinging is not working.Packets also not routing in that multilink interface.

Thnaks and Regards,

Senthil

Giuseppe Larosa · ‎03-10-2010

Hello Senthil,

I've asked you what is on the other side of the multilink PPP because for example you may be trying to build a PPP multink using serial interfaces of different Port adapters on flexwan modules in a Cisco 7600.

This is not supported.

Hope to help

Giuseppe

kumar94437 · ‎03-10-2010

Sir,

It is working multilink.sometimes only this type of status is happening.That is showing up both sides but not pinging.

After issuing shutdown and no shutdown commands at interface multilink it becomes ok.what might be the reason whether it is a transmission problem.

Regards,

Senthil

kumar94437 · ‎03-25-2010

Sir,

It is working multilink.sometimes only (for two days one time like that)this type of status is happening.That is showing up both sides but not pinging.

After issuing shutdown and no shutdown commands at interface multilink it becomes ok.what might be the reason whether it is a transmission problem.

Individually i have checked both links found ok.Can we use debug commands for finding the reason.Which debug command i have to use Kindly help us.

Thanks and Regards,

Senthil