From: Lupi, Guy (Guy.Lupi@xxxxxxxxxxxxx)
Date: Wed Jun 19 2002 - 10:39:07 GMT-3
By default, loopback addresses in OSPF are advertised as a /32, regardless
of the actual subnet mask. If you want to advertise the actual subnet mask,
then add the
"ip ospf network point-to-point" command in interface configuration mode.
*-----Original Message-----
*From: Hunt Lee [mailto:ciscoforme3@yahoo.com.au]
*Sent: Wednesday, June 19, 2002 9:30 AM
*To: ccielab@groupstudy.com
*Subject: Please help!!!
*
*
*This might be a simple answer. I have 3 routers:-
*
*RTA --- RTB --- RTC - 205.40.30.131 /26
*
*RTA & RTB - running EBGP
*RTB & RTC - running OSPF
*
*The network 205.40.30.131 is the IP of a Loopback interface, and it is
*advertised by OSPF's network command.
*
*OSPF is being redistributed into BGP at RTB.
*
*
*At RTC:-
*
*interface Loopback0
* ip address 205.40.30.131 255.255.255.192
*
*router ospf 30
* log-adjacency-changes
* network 10.0.0.0 0.255.255.255 area 0
* network 205.0.0.0 0.255.255.255 area 51
*
*
*Ok, here is what I'm confused about. At RTB, why is the BGP route for
*205.40.30.131 is a /32 (host route??) rather than a /26, or am
*I missing
*something important here??
*
*
*RouterB#sh ip bgp
*BGP table version is 4, local router ID is 172.17.1.1
*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
**> 10.1.1.0/30 0.0.0.0 0 32768 ?
**> 198.8.4.128/25 0.0.0.0 10 32768 ?
**> 205.40.30.131/32 10.1.1.2 5 32768 ?
*
*
*RouterA>sh ip bgp
*BGP table version is 4, local router ID is 172.17.1.2
*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
**> 10.1.1.0/30 172.17.1.1 0 0 2 ?
**> 198.8.4.128/25 172.17.1.1 10 0 2 ?
**> 205.40.30.131/32 172.17.1.1 5 0 2 ?
*RouterA>
*
*
*Thanks for your help.
*
*H.
*
*
*http://www.sold.com.au - SOLD.com.au
*- Find yourself a bargain!
This archive was generated by hypermail 2.1.4 : Tue Jul 02 2002 - 08:12:37 GMT-3