From: Derek Fage (DerekF@xxxxxxxxxxx)
Date: Wed Aug 04 1999 - 05:06:09 GMT-3
You could always look into the neighbor next-hop-self statement. It is
possible in a lab environment that you will be told that you cannot use any
static routes.
Derek...
> -----Original Message-----
> From: hon-siong chan [SMTP:honsiong@hotmail.com]
> Sent: 04 August 1999 08:51
> To: Alex.Dean@telecom.co.nz
> Cc: ccielab@groupstudy.com
> Subject: Re: BGP help needed
>
> 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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