From: Mustafa Bayramov (ICT/IT) (mustafa@azercell.com)
Date: Mon Jul 14 2003 - 08:40:42 GMT-3
Dmitry
Do debug ip routing on R1 and R6
Also debug ip rip on R1.
Then shutdown BGP neighbor to R16.
Past debug output here.
Regards
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Volkov, Dmitry (IDS Canada)
Sent: Sunday, July 13, 2003 5:51 PM
To: 'ccielab@groupstudy.com'
Subject: rip, bgp & default
http://www.cisco.com/en/US/tech/tk365/tk554/technologies_tech_note09186a0080
094374.shtml
<http://www.cisco.com/en/US/tech/tk365/tk554/technologies_tech_note09186a008
0094374.shtml>
Note: In IOS release 12.0T and later, RIP does not advertise the default
router if the route is not learned via RIP. Therefore, it may be necessary
to redistribute the route into RIP, or use the default-information originate
command.
ibgp--(170.70.200.1)R1(170.70.10.1)---rip---(.16)R16 (IOS 12.1.5 T14)
1) R1 gets default via IBGP; R1 doesn't redistr BGP to RIP but has
default-information originate command.
R1 doesn't advertise 0.0.0.0 network to R16
r1#
Network Next Hop Metric LocPrf Weight Path
*>i0.0.0.0 170.70.200.4 0 100 0 444 ?
r1#sh ip ro 0.0.0.0
Routing entry for 0.0.0.0/0, supernet
Known via "bgp 543", distance 200, metric 0, candidate default path
Tag 444, type internal
Last update from 170.70.200.4 00:00:00 ago
Routing Descriptor Blocks:
* 170.70.200.4, from 66.3.3.3, 00:00:00 ago
Route metric is 0, traffic share count is 1
AS Hops 1
r16#sh ip ro 0.0.0.0
% Network not in table
2) R1 does BGP redistr to RIP - default goes to R16
r16#sh ip ro 0.0.0.0
Routing entry for 0.0.0.0/0, supernet
Known via "rip", distance 120, metric 2, candidate default path
Redistributing via rip
Last update from 170.70.10.1 on Ethernet0, 00:00:00 ago
Routing Descriptor Blocks:
* 170.70.10.1, from 170.70.10.1, 00:00:00 ago, via Ethernet0
Route metric is 2, traffic share count is 1
3) Shut BGP neighbor - default goes to R16 !!!
r1(config)#router bgp 543
r1(config-router)#neighbor 66.3.3.3 shu
r16#sh ip ro 0.0.0.0
Routing entry for 0.0.0.0/0, supernet
Known via "rip", distance 120, metric 1, candidate default path
Redistributing via rip
Last update from 170.70.10.1 on Ethernet0, 00:00:00 ago
Routing Descriptor Blocks:
* 170.70.10.1, from 170.70.10.1, 00:00:00 ago, via Ethernet0
Route metric is 1, traffic share count is 1
Any explanations ??
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