From: omar parihuana (omar.parihuana@gmail.com)
Date: Mon Nov 03 2008 - 03:12:07 ARST
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!Blogs and organic groups at http://www.ccie.net
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