why cant i see other cdp neighbors?
infor...@netzero.net
interfaces are connected to switch 2924, when i try to see teh other
routers, i see only the switch , no routers at all
RouterA#sh cdp neigh
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID
Switch Eth 0 128 T S WS-C2924C-Fas 0/3
i went into the config mode and did
cdp run
still same situation
here is sh ip route
RouterA#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 5 subnets
I 172.16.50.0 [100/182671] via 172.16.20.2, 00:00:39, Serial0
I 172.16.40.0 [100/182571] via 172.16.20.2, 00:00:39, Serial0
I 172.16.30.0 [100/180671] via 172.16.20.2, 00:00:39, Serial0
C 172.16.20.0 is directly connected, Serial0
C 172.16.10.0 is directly connected, Ethernet0
any ideas?
thnx
Francois Labreque
RouterA# configure terminal
RouterA(conf)# interface ethernet0
RouterA(conf-if)# cdp enable
RouterA(conf-if)# exit
RouterA(conf)# end
RouterA# show cdp neighbor
>
> thnx
--
Francois Labreque | Unfortunately, there's no such thing as a snooze
flabreque | button on a cat who wants breakfast.
@ | - Unattributed quote from rec.humor.funny
videotron.ca
Hansang Bae
infor...@netzero.net says...
> i ave 3 2500 router connected through back to back cables, ethernet
> interfaces are connected to switch 2924, when i try to see teh other
> routers, i see only the switch , no routers at all
>
> RouterA#sh cdp neigh
> Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
> S - Switch, H - Host, I - IGMP, r - Repeater
>
> Device ID Local Intrfce Holdtme Capability Platform Port ID
> Switch Eth 0 128 T S WS-C2924C-Fas 0/3
It's working as advertised. There's nothing wrong. CDP works with SNAP
multicast frames and is only good for "one hop" *IF* you do a "sho cdp
neigh" from the switch, you'll see all the routers.
--
hsb
"Somehow I imagined this experience would be more rewarding" Calvin
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David Schwartz
>
> infor...@netzero.net wrote:
> >
> > i ave 3 2500 router connected through back to back cables, ethernet
> > interfaces are connected to switch 2924, when i try to see teh other
> > routers, i see only the switch , no routers at all
That's because you're only connected to the switch. Look on the switch
and you'll see the routers. CDP is not routable or even switchable.
DS
Andrzej Kowalczyk
> interfaces are connected to switch 2924, when i try to see teh other
> routers, i see only the switch , no routers at all
>
Check if you have cdp enabled on serial interfaces.
A
Dan Swartzendruber
hbae_@_nyc.rr.com.REMOVE_ says...
> In article <QOBl7.52480$8c3.10...@typhoon.tampabay.rr.com>,
> infor...@netzero.net says...
> > i ave 3 2500 router connected through back to back cables, ethernet
> > interfaces are connected to switch 2924, when i try to see teh other
> > routers, i see only the switch , no routers at all
> >
> > RouterA#sh cdp neigh
> > Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
> > S - Switch, H - Host, I - IGMP, r - Repeater
> >
> > Device ID Local Intrfce Holdtme Capability Platform Port ID
> > Switch Eth 0 128 T S WS-C2924C-Fas 0/3
>
>
> It's working as advertised. There's nothing wrong. CDP works with SNAP
> multicast frames and is only good for "one hop" *IF* you do a "sho cdp
> neigh" from the switch, you'll see all the routers.
I assume the one hop is implemented by the cisco switch? I got curious
and looked at a couple of our routers - one is connected to a 2924-XL,
and works as you observed. The other is connected (along with a number
of other routers) to a 3com, and all of them are visible on the 7200.
Ron
>
> In article <QOBl7.52480$8c3.10...@typhoon.tampabay.rr.com>,
> infor...@netzero.net says...
> > i ave 3 2500 router connected through back to back cables, ethernet
> > interfaces are connected to switch 2924, when i try to see teh other
> > routers, i see only the switch , no routers at all
> >
> > RouterA#sh cdp neigh
> > Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
> > S - Switch, H - Host, I - IGMP, r - Repeater
> >
> > Device ID Local Intrfce Holdtme Capability Platform Port ID
> > Switch Eth 0 128 T S WS-C2924C-Fas 0/3
>
> It's working as advertised. There's nothing wrong. CDP works with SNAP
> multicast frames and is only good for "one hop" *IF* you do a "sho cdp
> neigh" from the switch, you'll see all the routers.
>
> --
>
> hsb
You might try to turn off cdp at the switch tho I'm not sure you would
like the result. We have 3Com switches which ignore CDP so routers
running at 10 half on the one side of the switch see other routers
running at 100 full on the other side and they complain about interface
speed mismatches so much we have to turn off cdp.
Ron
Hansang Bae
dsw...@druber.com says...
> I assume the one hop is implemented by the cisco switch? I got curious
> and looked at a couple of our routers - one is connected to a 2924-XL,
> and works as you observed. The other is connected (along with a number
> of other routers) to a 3com, and all of them are visible on the 7200.
3Com's don't know a thing about cdp (naturallY) so I guess it'll just
flood the multcast frame.
Dan Swartzendruber
hbae_@_nyc.rr.com.REMOVE_ says...
> In article <MPG.16013cb5d...@news.supernews.net>,
> dsw...@druber.com says...
> > I assume the one hop is implemented by the cisco switch? I got curious
> > and looked at a couple of our routers - one is connected to a 2924-XL,
> > and works as you observed. The other is connected (along with a number
> > of other routers) to a 3com, and all of them are visible on the 7200.
>
>
> 3Com's don't know a thing about cdp (naturallY) so I guess it'll just
> flood the multcast frame.
that's what i'd figured. i just thought it was interesting that the
cisco switches suppress that.