I thought I'd throw my $.02 in here. I have seen two or three situations
here in our network where we had missing CDP neighbors. Our entire network
is point-to-point frame relay using subinterfaces. Take the following
layout:
RouterA <---> RouterB <---> RouterC
RouterB has a single interface with two frame relay subinterfaces connecting
to A and C. In our case, with CDP, A could see B, B could see C, but B
could not see A. We never figured out what the problem was. "show cdp int"
seemed to show no problems, as well as "debug cdp <whatever>".
Originally, A was running 11.2(17) while B and C were running 11.2(18). A
is now running 12.1(5a) and this has made no difference, I just checked.
> Hmm, strange thing. All is OK with 12.1.5.
>
> Router4#sh cdp int
> Ethernet0/0 is up, line protocol is up
> Encapsulation ARPA
> Sending CDP packets every 60 seconds
> Holdtime is 180 seconds
> Serial0/0 is up, line protocol is up
> Encapsulation FRAME-RELAY
> Sending CDP packets every 60 seconds
> Holdtime is 180 seconds
> Ethernet0/1 is up, line protocol is up
> Encapsulation ARPA
> Sending CDP packets every 60 seconds
> Holdtime is 180 seconds
> Router4#sh cdp n
> 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
> sw Eth 0/1 140 T S 1900 6
> sw Eth 0/0 140 T S 1900 4
> Router3 Ser 0/0 140 R 2610 Ser
> 0/2
>
> Frame Encapsulation is cisco.
>
> Chuck Larrieu wrote:
> >
> > I got to wondering about this.
> >
> > I am working on a frame relay troubleshooting lab, and I have a
situation in
> > my lab where I am seeing all my routes as I expect. In other words, I
> > believe I have solved the frame relay problem. However, in using that
pod to
> > check this CDP issue I find that CDP neighbors are indeed not showing
up. I
> > manually enabled CDP on all interfaces, and also ran CDP run in the
root
> > config menu. The debugs are indicating an encapsulation failure.
> >
> > As I said, all my routes are there and I have full ping ability from
end to
> > end. But no CDP.
> >
> > Interesting.
> >
> > IOS 12.1 something.
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf
Of
> > Roberts, Timothy
> > Sent: Thursday, January 11, 2001 4:19 PM
> > To: '[EMAIL PROTECTED]'; Roberts, Timothy
> > Cc: [EMAIL PROTECTED]
> > Subject: RE: Cant see CDP neighbor
> >
> > I Should have included in my last email that I already performed the
cdp
> > enable command.
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, January 11, 2001 4:05 PM
> > To: [EMAIL PROTECTED]
> > Cc: [EMAIL PROTECTED]
> > Subject: RE: Cant see CDP neighbor
> >
> > Robert make sure that you enable cdp on the interface. The command is
"CDP
> > enable". You have to be in config-interface mode. Let me know if this
> > works??
> >
> > Eric Washington
> > Banc Of America Securities - Japan
> > Information Technology / IS
> > [EMAIL PROTECTED]
> >
> > -----Original Message-----
> > From: Roberts, Timothy [mailto:[EMAIL PROTECTED]]
> > Sent: Friday, January 12, 2001 8:48 AM
> > To: '[EMAIL PROTECTED]'
> > Subject: Cant see CDP neighbor
> >
> > I have two routers connected back to back via two serial cables. I can
ping
> > each one from the other one. The problem is that they do not show up
when I
> > do a show cdp neighbor. I am sure that I am just overlooking something
> > small.
> > Thanks
> >
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