Unable to ping or traceroute from LAN Core Switch to WAN router

Unanswered Question
Apr 1st, 2008


I'm having a problem trying to ping from LAN core switch to the router. What could be the possible causes ?

I have this problem too.
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guruprasadr Tue, 04/01/2008 - 22:00

HI Joseph, [Pls Rate if HELPS]

>> Confirm whether you LAN Traffic can reach the destination via Router

>> Trace to the Router and check whether the trace completed

>> See in Router whether any ICMP Block has been configured for the LAN Switch IP Segments


Guru Prasad R

Goutam Sanyal Tue, 04/01/2008 - 22:04

Hi JOSEPH, can you post the traceroute output as well as extended ping's output. Thanks Goutam

sanjay.khurana Tue, 04/01/2008 - 23:25

Hi Friend,

Can u pls tell me ur switch model number and default route .. pls check also static route from switch to router and router switch.

send me also trace route result from switch 2 router and router 2 switch.

Rick Morris Wed, 04/02/2008 - 09:18

Kind of hard to assist without knowing how you are connected.

Is the switch directly connected to the router?

Is the interface us?

Are you trunking between the Router and Switch?

Do you have the correct encapsulation between the two?

What is the set-up and what is desired?

josephn Wed, 04/02/2008 - 18:47


There are Riverbed and Packet Shaper in between the switch and router. From the PS, I can ping and trace route to both the switch and router. So, the logical connection is something like below:

LAN Core SW ->Riverbed -> Packet Shaper -> Router


Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:


Success rate is 0 percent (0/5)


sw01>sh ip ro

Routing entry for

Known via "connected", distance 0, metric 0 (connected, via interface)

Routing Descriptor Blocks:

* directly connected, via FastEthernet3/3

Route metric is 0, traffic share count is 1

sw01>sh int FastEthernet3/3

FastEthernet3/3 is up, line protocol is up (connected)

Hardware is C6k 100Mb 802.3, address is 0007.b355.5000 (bia 0007.b355.5000)

Description: rt05 fa0/0 (Through Riverbed/Packershaper)

Internet address is

rt05#ping sw01

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:


Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms

rt05#sh ip ro sw01

Routing entry for

Known via "ospf 49", distance 110, metric 2, type intra area

Last update from on FastEthernet0/0, 01:22:45 ago

Routing Descriptor Blocks:

*, from, 01:22:45 ago, via FastEthernet0/0

Route metric is 2, traffic share count is 1


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