From: William Chen (kwchen@netvigator.com)
Date: Sat Dec 13 2003 - 23:01:53 GMT-3
Hi,
The loopback mask is 255.255.255.0.
I think normally in doing route filtering, you don't have to specify
mask. Then, 172.16.107.0, will means the route is 172.16.107.0 with any
mask. For example,
! RIP will only accept the route to 172.16.107.0 with ANY mask
access-list 7 permit 172.16.107.0
router rip
distribute-list 7 in
BTW, for this case I also try an extended ACL: "access-list 107 permit
ip host 172.16.107.0 host 255.255.255.0", but it doesn't work neither.
Best Regards,
William Chen
----- Original Message -----
From: <Arvinb@comcast.net>
To: "William Chen" <kwchen@netvigator.com>; <ccielab@groupstudy.com>
Sent: Sunday, December 14, 2003 1:12 AM
Subject: Re: BGP conditional default route advertisement.
> 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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