From: Simon Baxter (Simon.Baxter@xxxxxxxxxxxxxx)
Date: Tue Dec 05 2000 - 02:11:21 GMT-3
Can you send me more of the config?
I can't see how this is working. If the 47.255.255.255.4 network goes down,
won't BGP keepalives re-route via the backup? (assuming you're running
multihop and upd lo0 - and running a filtered (so not always connected) IGP
over the link)??
looks good though!!! I'm sure I've got the wrong end of the stick!
Simon
-----Original Message-----
From: Ronnie Royston [mailto:RonnieR@globaldatasys.com]
Sent: Tuesday, December 05, 2000 10:29 AM
To: 'ccielab@groupstudy.com'
Subject: BGP - advertise map ... non-exist-map
In case anyone hasn't practiced this feature, ...I am currently using it in
a test environment as a means of bringing up BRI backup for a remote AS when
the frame link (47.255.255.4/30) goes down. No floating statics and no
backup interface commands! This could be a good trick to know...
router bgp 100
***text omitted***
neighbor 17.255.255.6 remote-as 300
neighbor 17.255.255.6 advertise-map ToL7 non-exist-map If_No_47
!
ip classless
access-list 10 permit 47.0.0.0 0.255.255.255
access-list 17 permit 17.0.0.0 0.255.255.255
access-list 101 permit ip any any
route-map If_No_47 permit 10
match ip address 10
!
route-map ToL7 permit 10
match ip address 101
*** With frame link administratively down ***
L7#sho ip bgp
BGP table version is 55, local router ID is 77.255.255.17
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 11.0.0.0 17.255.255.5 0 0 100 ?
*> 14.0.0.0 17.255.255.5 0 0 100 ?
*> 17.0.0.0 0.0.0.0 0 32768 ?
*> 23.0.0.0 17.255.255.5 0 100 ?
*> 33.0.0.0 17.255.255.5 0 100 ?
*> 34.0.0.0 17.255.255.5 0 100 ?
*> 44.0.0.0 17.255.255.5 0 100 ?
*> 77.0.0.0 0.0.0.0 0 32768 ?
L7#conf t
Enter configuration commands, one per line. End with CNTL/Z.
L7(config)#int se0
L7(config-if)#no shut
****after about 60 seconds for reconvergence***
L7#sho ip bgp
BGP table version is 63, local router ID is 77.255.255.17
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 11.0.0.0 47.255.255.5 0 100 ?
*> 14.0.0.0 47.255.255.5 0 0 100 ?
*> 17.0.0.0 0.0.0.0 0 32768 ?
*> 22.0.0.0 47.255.255.5 0 100 200 ?
*> 23.0.0.0 47.255.255.5 0 100 ?
*> 33.0.0.0 47.255.255.5 0 100 ?
*> 34.0.0.0 47.255.255.5 0 0 100 ?
*> 44.0.0.0 47.255.255.5 0 0 100 ?
*> 47.0.0.0 0.0.0.0 0 32768 ?
*> 77.0.0.0 0.0.0.0 0 32768 ?
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