[c-nsp] Link Discovery Error

[Carlos Vicente]

If you can get CDP/LLDP information, that's good.  If you can't (not all
vendors support this), you can still find these links.  Hint: look at
the other side instead (the switch).  The idea is that if the switch
forwarding table has only one entry on a given port, and that entry has
a router's interface MAC address, you have a link.

Our Network Documentation Tool (open source) does this pretty well.  It
analyzes information from CDP/LLDP, Spanning Tree state and forwarding
tables.  Available at:

http://netdot.uoregon.edu

cv

jaikar gupta wrote:
> Thanks peter but i want to Know MAC-addresses.
>
>
> Thanks & Regards
> Jaikar Gupta
>
>
> On Thu, May 27, 2010 at 6:16 PM, Peter Rathlev <peter at rathlev.dk> wrote:
>
>   
>> On Thu, 2010-05-27 at 17:57 +0530, jaikar gupta wrote:
>>     
>>> ipNetToMediaTable contains the entry of all the devices which are
>>> reachable from the router but i want to know the devices which are
>>> directly connected with the router.
>>>       
>> You either want MAC-addresses or CDP neighbor information, right? For
>> the latter you can use CISCO-CDP-MIB::cdpCache*. Newer devices might
>> support LLDP-MIB instead, which is more cross-platform compatible.
>>
>> If you're just doing neighbor discovery, what do you need the MAC
>> address tables/ARP tables for?
>>
>> --
>> Peter
>>
>>
>>
>>     
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-- 
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Carlos Vicente                  Tel    :  +1(541) 346-1763
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