Maximum-path ibgp
Hi,
I need to understand the difference between normal maximum-path ibgp and maximum-path ibgp import. Now suppose if a PE is getting a same route from 2 different PE via a ibgp VPNv4 session.
So if maximum-path ibgp is configured in that address-family it will put 2 routes in the VRF routing table. So what difference will it make if i configure import keyword along with this command.
thanks
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Hello,
The main purpose of this to improve the convergence time if you’ve multiple route reflectors and the next hop is the same.
For your setup, it may not make a difference as you are only learning the prefix from two PEs, this feature is usually used where you’ve multiple Route-reflectors where route is only imported from the RR with the lower loopback.
…Muhammad
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Hi,
but if maximum path is configured and next hop are 2 diffrent PE , so wont it install both next hops in routing table if MXIMUM-path ibgp is configured.
On Wed, Mar 31, 2010 at 7:29 PM, Muzammil Mukhtar < muzammil_mukhtar@hotmail.com> wrote:
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It will, that’s the default behaviour of maximum-path, whatever routes marked as mutlipath in the BGP table will be insterted into the routing table.
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requisest you to please explain in detail you were talking about RR
On Wed, Mar 31, 2010 at 8:27 PM, Muzammil Mukhtar < muzammil_mukhtar@hotmail.com> wrote:
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What tends to happen is let’s say you’ve 4 RR and your P,PE routers imports routes from them but only one RR gets elected out of the 4 RR but if you want to import routes from all of these RR than you choose the command Import.
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so you mean if I have topology with PE1 advertising 1.1.1.0/24
PE1 is peering with 4 RR (VPNV4)…..Route update will be their in BGP table from all RR ( 4 RR’s)…..but I’ll install only one …
If I use import comand it will insall all updates from 4 RR in routing table <<<<<
On Wed, Mar 31, 2010 at 10:26 PM, Muzammil Mukhtar < muzammil_mukhtar@hotmail.com> wrote:
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You got it, except, route update will not be in BGP table. BGP table will show the import from only one RR, if you do the “import command” than it will install all of them in BGP table.
From BGP to RIB, it is a different selection mechanism based on BGP attirbutes and whether you’ve iBGP multipath, ibgp unequal cost..etc.
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so you mean if I have topology with PE1 advertising 1.1.1.0/24
PE1 is peering with 4 RR (VPNV4)…..Route update will be their in BGP table from all RR ( 4 RR’s)…..but I’ll install only one …
If I use import comand it will insall all updates from 4 RR in routing table <<<<<
On Wed, Mar 31, 2010 at 10:26 PM, Muzammil Mukhtar wrote:
What tends to happen is let’s say you’ve 4 RR and your P,PE routers imports routes from them but only one RR gets elected out of the 4 RR but if you want to import routes from all of these RR than you choose the command Import.
href=”mailto:jckdaniels12@gmail.com”>jckdaniels12@gmail.com href=”mailto:muzammil_mukhtar@hotmail.com”>muzammil_mukhtar@hotmail.com href=”mailto:naman.prep@gmail.com”>naman.prep@gmail.com; ccielab@groupstudy.com href=”mailto:muzammil_mukhtar@hotmail.com”>muzammil_mukhtar@hotmail.com> wrote: href=”mailto:jckdaniels12@gmail.com”>jckdaniels12@gmail.com href=”mailto:muzammil_mukhtar@hotmail.com”>muzammil_mukhtar@hotmail.com href=”mailto:naman.prep@gmail.com”>naman.prep@gmail.com; ccielab@groupstudy.com href=”mailto:muzammil_mukhtar@hotmail.com”>muzammil_mukhtar@hotmail.com> wrote: multiple href=”mailto:naman.prep@gmail.com”>naman.prep@gmail.com href=”mailto:ccielab@groupstudy.com”>ccielab@groupstudy.com ibgp route will i _______________________________________________________________________ now.
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so import has to be configured under VPNV4 session of bgp <<<<<>>>>>>is their any clause of cluster-id in this case for RR???
On Wed, Mar 31, 2010 at 10:48 PM, Muzammil Mukhtar < muzammil_mukhtar@hotmail.com> wrote:
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That’s right
It doesn’t work this way in in MP-BGP situation, routes get imported from RR that has the lower loopback id, PE will not import the routes from all RR for same prefix pointing to same next-hop.
…Muhammad
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if it was BGP IPV4 then will it have imported routes from all 4 RR for same prefix by default ?
On Wed, Mar 31, 2010 at 11:15 PM, Muzammil Mukhtar < muzammil_mukhtar@hotmail.com> wrote:
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I believe that’s right in case of normal BGP.
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if it was BGP IPV4 then will it have imported routes from all 4 RR for same prefix by default ?
On Wed, Mar 31, 2010 at 11:15 PM, Muzammil Mukhtar wrote:
That’s right
It doesn’t work this way in in MP-BGP situation, routes get imported from RR that has the lower loopback id, PE will not import the routes from all RR for same prefix pointing to same next-hop.
…Muhammad
href=”mailto:jckdaniels12@gmail.com”>jckdaniels12@gmail.com href=”mailto:muzammil_mukhtar@hotmail.com”>muzammil_mukhtar@hotmail.com href=”mailto:naman.prep@gmail.com”>naman.prep@gmail.com; ccielab@groupstudy.com case href=”mailto:muzammil_mukhtar@hotmail.com”>muzammil_mukhtar@hotmail.com> wrote: href=”mailto:jckdaniels12@gmail.com”>jckdaniels12@gmail.com href=”mailto:muzammil_mukhtar@hotmail.com”>muzammil_mukhtar@hotmail.com href=”mailto:naman.prep@gmail.com”>naman.prep@gmail.com; ccielab@groupstudy.com href=”mailto:muzammil_mukhtar@hotmail.com”>muzammil_mukhtar@hotmail.com> wrote: imports href=”mailto:jckdaniels12@gmail.com”>jckdaniels12@gmail.com href=”mailto:muzammil_mukhtar@hotmail.com”>muzammil_mukhtar@hotmail.com href=”mailto:naman.prep@gmail.com”>naman.prep@gmail.com; ccielab@groupstudy.com href=”mailto:muzammil_mukhtar@hotmail.com”>muzammil_mukhtar@hotmail.com> wrote: routes routing href=”mailto:jckdaniels12@gmail.com”>jckdaniels12@gmail.com href=”mailto:muzammil_mukhtar@hotmail.com”>muzammil_mukhtar@hotmail.com href=”mailto:naman.prep@gmail.com”>naman.prep@gmail.com; ccielab@groupstudy.com so href=”mailto:muzammil_mukhtar@hotmail.com”>muzammil_mukhtar@hotmail.com> wrote: you’ve the href=”mailto:naman.prep@gmail.com”>naman.prep@gmail.com href=”mailto:ccielab@groupstudy.com”>ccielab@groupstudy.com make _______________________________________________________________________ now. more.
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On Wed, Mar 31, 2010 at 11:23 PM, Muzammil Mukhtar < muzammil_mukhtar@hotmail.com> wrote:
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