Able to Ping over Wan Link but not from directly connected Switch

[mahesh18]

                   Hi Everyone,

I am able to ping IP over the Wan link but not from directly connected switch.

what things i should look for on directly connected switch like ACL with ICMP allowed etc?

Thanks

Mahesh

[John Blakley · Accepted solution]

Mahesh,

It can be many things. Is this remote from site A wan to site B wan you can ping, or do you mean that you can ping from the wan interface on the router, but the switch behind that router cannot ping?

HTH,
John

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[mahesh18]

Hi John,

I can ping from Remote Site A to Site B  over wan link

Thanks

MAhesh

[John Blakley]

Let's say that side A is the switch that can't get to the B wan link, does B know how to get back to A's inside networks or is A configured for nat? If A isn't configured with Nat, B will need a route pointing to A for any internal networks that A supports.

HTH,
John

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[mahesh18]

Hi John,

I figure that ping works from Local site by using ping vrf command.

Can you  please tell me about vrf ?

Thanks

mahesh

[Reza Sharifi · Accepted solution]

Hi Mahesh,

vrf provide logical separation within the same or multiple devices.

If for example you have two customers connected to a switch or router and you don't want the customers to see each other's routes, you put each customer is a different vrf. Each vrf has its own routing table and when you ping customer a you have to use the vrf name with that ping.  If you are trying to ping customer b, you have to includes customer b vrf in that ping.

here is good doc to read:

http://www.cisco.com/en/US/docs/optical/15000r4_6/ethernet/454/guide/vrf.pdf

HTH

Reza

[mahesh18]

Hi Reza & John,

Many thanks again.

I will read about VRF  from the above link.

Regards

MAhesh