From: hon-siong chan (honsiong@xxxxxxxxxxx)
Date: Wed Aug 04 1999 - 04:51:04 GMT-3
Alex,
Q1. Yes, it worked after putting a static route! So the concept I got now is
"Whenever there's an ebgp-multihop statement, you either specify a static
route or IGP to get to the indirectly connected next BGP hop interface."
Q2. R1 loopbacks are advertised in fact....I found my mistake as I need to
advertise the network between R1 & R3 also & redistribute them.
Really appreciate your advise, Alex, MANY THANKS!
Regards
HonSiong
>From: "Alex Dean" <Alex.Dean@telecom.co.nz>
>Reply-To: "Alex Dean" <Alex.Dean@telecom.co.nz>
>To: <ccielab@groupstudy.com>
>CC: <honsiong@hotmail.com>
>Subject: Re: BGP help needed
>Date: Wed, 04 Aug 1999 15:36:25 +1200
>
>For Q1 you need a route to the remote interface on its neighbor. Either
>use a static route or another IGP. Once you can ping the interface - then
>you can use it aswith the ebgp multihop command and sepcify an update
>source.
>
>For Q2, you need to make sure R4 is advertising its loopbacks. Either use
>a network statement for them, or use a static route to null 0 (you can
>effectively summarise it with this command) and redistribute it. In
>practice a more specific route will be used so the route to null will be
>ignored.
>
>Hope this helps.
>
>Cheers
>Alex Dean
>
>
>
> >>> "hon-siong chan" <honsiong@hotmail.com> 04/08/99 14:43:50 >>>
>I need help on my BGP problems encountered in my own practise
>lab......Below
>is the diagram: (Sorry for the length of question!)
>
>
> R1-------R3--------R2
> |
> |
> |
> R4
>
>R1 has 2 loopbacks and 1 serial to R3: int lo0 172.16.4.1/28
> int lo1 172.16.6.1/28
> int S0 172.16.1.1/24
>
>R2 has 1 loopback & 1 serial to R3: int lo0 172.16.5.1/24
> int S0 172.16.2.1/24
>
>R3 has 2 serials to R1/R2 & 1 ethernet to R4: int S0 172.16.1.2/24
> int S1 172.16.2.2/24
> int e0 172.16.3.1/24
>
>R4 has 1 loopback & 1 ethernet to R3: int lo0 172.16.0.33/27
> int e0 172.16.3.2/24
>
>I configured R1,R2 & R3 in BGP AS200, and running OSPF as area 0; while R4
>in BGP AS400 only. R3 & R4 are pointing to indirectly connected interfaces;
>R3 points to R4's lo0, and R4 points to R3 S0, so I used ebgp-multihop
>command & update-source command respectively.I also redistribute BGP AS200
>into OSPF area 0.
>
>Q1: When I issued "sh ip bgp neighbor". The state is only Active and no
>active TCP connection established.
>
>Only when I point to directly connected interfaces without using
>ebgp-multihop & update-souce commands then the link between R3 & R4 is
>established???Why?
>
>Q2: I need R2, R3 & R4 to be able to see routes from R1's loopbacks. Do I
>need to summarise the 2 loopbacks in R1? What do I need to do?
>
>Any comments are much appreciated....
>
>Regards
>HonSiong
>
>
>
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