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Can't ping CISCO 3750 on Nortel Netwok

I have a CISCO 3750 switch on our Nortel network that is fully operational. I can't ping it from the core but I can ping the core from it. It wouldn't be a big deal but PING is our only method to monitor the switch as we manage our network on Nortel's ESM. Security setting??
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141ANG
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141ANG
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1 Solution
 
atlas_shudderedSr. Network EngineerCommented:
Assuming you have set up a loopback or int vlan x ip address on the 3750, have you run no shut on the interface?
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Don JohnstonInstructorCommented:
Pings are bidirectional. If device A can ping device B, then B will be able to ping A. The only thing that will cause a unidirectional ping is a firewall, access-list or some traffic filter.


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MiamiCoCommented:
donjohnston: but (generally) if  device has IP 10.1.0.1 and mask 255.0.0.0 and device B has IP 10.2.0.1 and mask 255.255.0.0 then device A can ping to device B , but device B cant reply back. Am I right?
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Don JohnstonInstructorCommented:
Not really. You're thinking only of the ICMP Echo Request. In which case, you are correct. The echo request from A will get to B, but an echo request from B will not make it to A.

However a ping also has an ICMP Echo Reply which is the response to the echo request. When a device receives the echo reply, it displays some type of success message at the user interface.

In your (first) example above, B would receive the echo request, but the reply wouldn't make it back to A so the person issuing the ping would get a failure (or "not successful") message displayed.
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atlas_shudderedSr. Network EngineerCommented:
However, if the since the vlan interfaces are virtual, you can ping from them without being able to ping to them if they are in a shutdown state.
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Don JohnstonInstructorCommented:
Huh?

I have no idea what you're trying to say.

That you can ping from a virtual interface if it's shutdown?
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MiamiCoCommented:
Back to this question, can be there a "misconfiguration" ? Would not be better to save configuration of this switch and then reset it to factory setting?
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CCI_ITCommented:
Directly connected to the core?
passes through a firewall?
ICMP disabled on the 3750 interface?
layer 2 between the 2 or layer 3?
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141ANGAuthor Commented:
I cleaned up a couple conflicting and ambiguous commands and re-entered the default-gateway address and I am in business. Thanks for the info.
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