03-24-2009 02:17 AM
Dear everyone:
There are two routes to a same destination,but snmp can just identify only one
of them,exactly the bigger on,for instance:
GZ-THRJY-DSW-1.I>sh ip route 172.16.48.0
Routing entry for 172.16.48.0/24
Known via "ospf 100", distance 110, metric 21, type extern 1
Last update from 192.168.20.186 on Vlan5, 1w4d ago
Routing Descriptor Blocks:
192.168.20.54, from 192.168.0.4, 1w4d ago, via Vlan2
Route metric is 21, traffic share count is 1
* 192.168.20.186, from 192.168.0.4, 1w4d ago, via Vlan5
Route metric is 21, traffic share count is 1
192.168.20.57, from 192.168.0.11, 1w4d ago, via Vlan25
Route metric is 21, traffic share count is 1
======
But I use snmp to walk everything on this switch and redirect the result to a file. I searched the file afterwards and found that snmp only gave me one result:
RFC1213-MIB::ipRouteNextHop.172.16.48.0 = IpAddress: 192.168.20.54
,which is not in use(marked "*"),anyway.
Could you help me to solve the problem?
Can I trust the snmp to do sth like topology discovery?
03-24-2009 05:06 AM
The topology discovery won't rely on this.
In fact it relies only on the CDP tables.
So any connection between 2 cisco devices where CDP is active will be shown in the topology.
(except phones)
Cheers,
Michel
03-24-2009 05:33 AM
You might be right.
But consider a cisco and Huawei(and some Nokia fw ...) network environment.CDP is only used among cisco's,but snmp looks like a standard protocol and it can help finding some information which can be "show"(or "display")in a switch.I've tried that HuaWeis' can display all route by using snmp,but cisco can't.
That's what I'm looking for.
I actually want to get the routing information from devices , not only want to discover the topology,which I mentioned before is not excactly.
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