From: Hobbs (deadheadblues@gmail.com)
Date: Mon Nov 03 2008 - 16:56:09 ARST
you can do debug ip icmp, that would show you ttl exceeded messages being
received
On Sun, Nov 2, 2008 at 10:28 PM, Omkar Tambalkar <omkar.groupstudy@gmail.com
> wrote:
> when you do a debug ip packet detail, you can see the source/destination IP
> address of the BGP packets going to TCP 179, if you are not getting a
> response from the other side or you are getting a reply from the physical
> interface IP address with TTL 0 then you know that your BGP packet is being
> dropped by the neighbor before reaching the loopback address.
>
> -HTH - Omkar
>
> On Sun, Nov 2, 2008 at 9:12 PM, omar parihuana <omar.parihuana@gmail.com
> >wrote:
>
> > Hi GS,
> >
> > Here the scenario:
> >
> > One router called router R1and other router R2, R1 belong to AS100 and R2
> > belong to AS200 both directly connected. I need to establish an eBGP
> > between
> > R1 and R2 using loopback interfaces. I have the R1's looback (1.1.1.1)
> and
> > I
> > can pinging from R2's loopback (2.2.2.2) and viceversa too. However, I
> > cannot see the R2 and R1 configuration only show and debug commands (no
> > included sh run) are allowed.
> >
> > R2#ping 1.1.1.1 source 2.2.2.2
> >
> > Type escape sequence to abort.
> > Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
> > Packet sent with a source address of 2.2.2.2
> > !!!!!
> > Success rate is 100 percent (5/5), round-trip min/avg/max = 4/137/236 ms
> > R2#
> >
> > R2#sh ip bgp summary
> > BGP router identifier 2.2.2.2, local AS number 200
> > BGP table version is 8, main routing table version 8
> > 1 network entries using 117 bytes of memory
> > 1 path entries using 52 bytes of memory
> > 2/1 BGP path/bestpath attribute entries using 248 bytes of memory
> > 0 BGP route-map cache entries using 0 bytes of memory
> > 0 BGP filter-list cache entries using 0 bytes of memory
> > BGP using 417 total bytes of memory
> > BGP activity 4/3 prefixes, 4/3 paths, scan interval 60 secs
> >
> > Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
> > State/PfxRcd
> > 1.1.1.1 4 100 0 0 0 0 0 never Idle
> >
> > The same results as above from R1 as well. The question is: what
> > configuration is missing in both routers in order to establish an eBGP
> > session. After tried some isolate test the missing configuration is:
> > neighbor x.x.x.x ebgp-multihop 2. where x.x.x.x is the loopback
> respective.
> > However, my question is: what show command or debug command permit me to
> > know that eBGP is missing: I typed the follow debug commands (in both
> > routers) without success:
> >
> > R1#sh debugging
> > IP routing:
> > BGP events debugging is on
> > TCP:
> > TCP special event debugging is on
> > TCP Packet debugging is on
> >
> > And it wasn't possible for me to determine what ebgp-multihop was
> > missing...
> >
> >
> > Maybe since that BGP state is idle, should I think that is ebgp-multihop
> > issue?
> >
> > Rgds.
> >
> > --
> > Omar E.P.T
> > -----------------
> > Certified Networking Professionals make better Connections!
> >
> >
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