From: Arvinb@comcast.net
Date: Sat Dec 13 2003 - 14:12:47 GMT-3
Pls check the mask of loopback adress. if you don't use wild mask in ACL, it
takes 0.0.0.0 means match all the bits. In this case default will be
originate when you have 172.16.107.0 /32 in the routing table.
regds
Arvind
----- Original Message -----
From: "William Chen" <kwchen@netvigator.com>
To: <ccielab@groupstudy.com>
Sent: Saturday, December 13, 2003 1:48 AM
Subject: BGP conditional default route advertisement.
> Dear all,
>
> I am not understand why the BGP conditional advertised default
> route is going to be like that in this router.
>
> ! Here is the BGP setting and the route-map
> router bgp 700
> bgp log-neighbor-changes
> network 7.7.7.0 mask 255.255.255.0
> neighbor 172.16.34.3 remote-as 100
> neighbor 172.16.34.3 default-originate route-map existLo
> neighbor 172.16.34.4 remote-as 100
> neighbor 172.16.34.4 default-originate route-map existLo
> !
> !
> access-list 7 permit 172.16.107.0
> !
> route-map existLo permit 10
> match ip address 7
> !
>
> ! Here is the routing table
> Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
> i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
> area
> * - candidate default, U - per-user static route, o - ODR
> P - periodic downloaded static route
>
> Gateway of last resort is not set
>
> 172.16.0.0/24 is subnetted, 16 subnets
> i L1 172.16.61.0 [115/40] via 172.16.34.4, Ethernet1/0
> i L1 172.16.51.0 [115/20] via 172.16.34.4, Ethernet1/0
> i L1 172.16.36.0 [115/40] via 172.16.34.4, Ethernet1/0
> C 172.16.34.0 is directly connected, Ethernet1/0
> i L1 172.16.25.0 [115/20] via 172.16.34.4, Ethernet1/0
> i L1 172.16.10.0 [115/20] via 172.16.34.4, Ethernet1/0
> i L1 172.16.11.0 [115/30] via 172.16.34.4, Ethernet1/0
> i L1 172.16.120.0 [115/30] via 172.16.34.4, Ethernet1/0
> i L1 172.16.110.0 [115/20] via 172.16.34.4, Ethernet1/0
> i L1 172.16.104.0 [115/10] via 172.16.34.4, Ethernet1/0
> i L1 172.16.105.0 [115/20] via 172.16.34.4, Ethernet1/0
> i L1 172.16.106.0 [115/40] via 172.16.34.4, Ethernet1/0
> C 172.16.107.0 is directly connected, Loopback107
> i L1 172.16.101.0 [115/20] via 172.16.34.4, Ethernet1/0
> i L1 172.16.102.0 [115/20] via 172.16.34.4, Ethernet1/0
> i L1 172.16.103.0 [115/40] via 172.16.34.4, Ethernet1/0
> 7.0.0.0/24 is subnetted, 1 subnets
> C 7.7.7.0 is directly connected, Loopback71
>
> ! BGP default route is not advertised
> FRS#sh ip bgp nei | in def
> Default information originate, default route-map existLo, default not
sent
> Default information originate, default route-map existLo, default not
sent
>
> ! Then I change the access-list 7, and the default route is advertised
> FRS#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> FRS(config)#no access-list 7
> FRS(config)#access-list 7 permit 172.16.107.0 0.0.0.255
> FRS(config)#end
> FRS#sh ip bgp nei | in def
> Default information originate, default route-map existLo, default sent
> Default information originate, default route-map existLo, default sent
> FRS#
>
> Any idea? Here is the "sh ver" output of the router:
> FRS#sh ver
> Cisco Internetwork Operating System Software
> IOS (tm) 3600 Software (C3620-JK8O3S-M), Version 12.2(4)T6, RELEASE
SOFTWARE
> (fc1)
> TAC Support: http://www.cisco.com/tac
> Copyright (c) 1986-2003 by cisco Systems, Inc.
> Compiled Fri 30-May-03 20:23 by eaarmas
> Image text-base: 0x600089A8, data-base: 0x61924000
>
> ROM: System Bootstrap, Version 11.1(7)AX [kuong (7)AX], EARLY DEPLOYMENT
> RELEASE SOFTWARE (fc2)
>
> FRS uptime is 5 hours, 15 minutes
> System returned to ROM by reload
> System restarted at 15:40:09 HKT Fri Dec 12 2003
> System image file is "flash:c3620-jk8o3s-mz.122-4.t6.bin"
>
> cisco 3620 (R4700) processor (revision 0x81) with 61440K/4096K bytes of
> memory.
> Processor board ID 07123827
> R4700 CPU at 80Mhz, Implementation 33, Rev 1.0
> Bridging software.
> X.25 software, Version 3.0.0.
> SuperLAT software (copyright 1990 by Meridian Technology Corp).
> TN3270 Emulation software.
> 1 Ethernet/IEEE 802.3 interface(s)
> 1 Token Ring/IEEE 802.5 interface(s)
> 2 Serial network interface(s)
> 4 Low-speed serial(sync/async) network interface(s)
> DRAM configuration is 32 bits wide with parity disabled.
> 29K bytes of non-volatile configuration memory.
> 16384K bytes of processor board System flash (Read/Write)
>
> Configuration register is 0x2102
>
> Best Regards,
> William Chen
>
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