From: Volkov, Dmitry (IDS Canada) (dmitry_volkov@ca.ml.com)
Date: Mon May 12 2003 - 20:22:35 GMT-3
Hello group,
Can anybody explain that ??
On R8 I have in RT prefix via Null0 with AD 250 better than learned via
IBGP with AD 200 ??
R8-------R4------R5
R8 and R4 run IBGP, R4 and R5 EIGRP
network 170.240.0.0/19 in EIGRP and in RT on R4:
D EX 170.240.0.0/19 [170/281600] via 206.143.72.142, 01:49:29,
Ethernet0/0
R4#
router bgp 1
network 170.240.0.0 mask 255.255.224.0
R8#
router bgp 1
network 170.240.0.0 mask 255.255.224.0
!
ip route 170.240.0.0 255.255.224.0 Null0 250
r8#sh ip bgp 170.240.0.0 255.255.224.0
BGP routing table entry for 170.240.0.0/19, version 29
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Advertised to non peer-group peers:
206.143.95.49
Local
206.143.95.242 (metric 896000) from 206.143.95.242 (206.143.95.242)
Origin IGP, metric 281600, localpref 100, valid, internal, best
r8#sh ip ro 170.240.0.0
Routing entry for 170.240.0.0/19
Known via "static", distance 250, metric 0 (connected)
Redistributing via eigrp 100
Routing Descriptor Blocks:
* directly connected, via Null0
Route metric is 0, traffic share count is 1
r8(config)#access-list 10 permit 170.240.0.0 0.0.31.255
r8(config)#^Z
r8#deb ip routing 10
IP routing debugging is on for access list 10
r8#
r8#conf t
Enter configuration commands, one per line. End with CNTL/Z.
r8(config)#no ip route 170.240.0.0 255.255.224.0 Null0 250
r8(config)#
07:12:01: RT: del 170.240.0.0/19 via 0.0.0.0, static metric [250/0]
07:12:01: RT: delete subnet route to 170.240.0.0/19
07:12:01: RT: network 170.240.0.0 is now variably masked
07:12:01: RT: add 170.240.0.0/19 via 206.143.95.242, bgp metric [200/281600]
r8(config)#^Z
r8#conf t
r8#sh ip ro 170.240.7.1
Routing entry for 170.240.0.0/19
Known via "bgp 1", distance 200, metric 281600, type internal
Redistributing via eigrp 100
Last update from 206.143.95.242 00:00:15 ago
Routing Descriptor Blocks:
* 206.143.95.242, from 206.143.95.242, 00:00:15 ago
Route metric is 281600, traffic share count is 1
AS Hops 0
r8#conf t
r8(config)#ip route 170.240.0.0 255.255.224.0 Null0 250
r8(config)#^Z
r8#clear ip bgp *
r8#
07:14:54: %BGP-5-ADJCHANGE: neighbor 206.143.95.49 Down User reset
07:14:54: %BGP-5-ADJCHANGE: neighbor 206.143.95.242 Down User reset
r8#
07:14:54: RT: delete route to 170.240.24.0/21
07:14:54: RT: delete route to 170.240.0.0/19
07:14:54: RT: add 170.240.0.0/19 via 0.0.0.0, static metric [250/0]
r8#
07:15:23: %BGP-5-ADJCHANGE: neighbor 206.143.95.242 Up
r8#
07:15:23: RT: network 170.240.0.0 is now variably masked
07:15:23: RT: add 170.240.24.0/21 via 206.143.95.242, bgp metric
[200/281600]
r8#
07:15:33: %BGP-5-ADJCHANGE: neighbor 206.143.95.49 Up
r8#sh ip ro 170.240.0.0
Routing entry for 170.240.0.0/19
Known via "static", distance 250, metric 0 (connected)
Redistributing via eigrp 100
Routing Descriptor Blocks:
* directly connected, via Null0
Route metric is 0, traffic share count is 1
r8#sh ip bgp
* i170.240.0.0/19 206.143.95.242 281600 100 0 i
*> 0.0.0.0 0 32768 i
170.240.0.0/19 exist in BGP - valid and best , however route via Null (with
higher AD) is installed in RT.
Why ???
Dmitry Volkov
CCIE # 10292
This archive was generated by hypermail 2.1.4 : Mon Jun 02 2003 - 15:13:41 GMT-3