From: Derek Fage (DerekF@xxxxxxxxxxx)
Date: Thu Aug 05 1999 - 05:31:44 GMT-3
Sorry - I did not read the question properly.
I was thinking of the case where your EBGP routers had routes to each other,
but IBGP routers saw the route as the external interface of a router that it
does not have a route to.
Derek...
> -----Original Message-----
> From: hon-siong chan [SMTP:honsiong@hotmail.com]
> Sent: 05 August 1999 07:41
> To: DerekF@ITEXJSY.com
> Cc: ccielab@groupstudy.com
> Subject: RE: BGP help needed
>
>
> Hi Derek,
>
> How do I use the "next-hop-self" statement when it is pointing to a
> router's
> interface (indirectly connected...), but not another router? ISn't that
> the
> solutions to using "ebgp-multihop" are either static router or IGP?
>
> Regards
> HonSiong
>
> >From: Derek Fage <DerekF@ITEXJSY.com>
> >To: 'hon-siong chan' <honsiong@hotmail.com>, Alex.Dean@telecom.co.nz
> >CC: ccielab@groupstudy.com
> >Subject: RE: BGP help needed
> >Date: Wed, 4 Aug 1999 09:06:09 +0100
> >
> >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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