Re: Router-ID & BGP address-family questions

Most likely hard coding the router-id is a design thing during an initial
implementation of an IGP/BGP/MPLS vpn.. And also helps you a lot to keep the
network organized, for example:

When you are troubleshooting OSPF and you want to look deeper into an LSA
table, this is a type of situation where having hardcoded router-id HELPS,
and a lot!! :D

About the 'no bgp default ipv4-unicast', try to imagine this way:

You have a children and you prepare hiwwm not only to speak English, but
also spanish. Same with routers, in other words, whenever you issue this
command it means "be multi address-families oriented" and check the neighbor
activate command inside every AF to see on what address familiar each
neighbor has to be called in order to be reachable.

The command "bgp upgrade-cli" does the same job but not considered a best
practice :-)

Cheers,

Jeferson.

2011/2/1 Hussam EL Kebbi <hussamkibbi_at_hotmail.com>

> Hi, Thank you for your email.
>
> 1 - So it is mostly important when we have virtual links?
>
> 2- Can we not use: no bgp default ipv4-unicast, or we should do that?
>
>
>
>
> > CC: ccielab_at_groupstudy.com
> > From: jefersonf_at_gmail.com
> > Subject: Re: Router-ID & BGP address-family questions
> > Date: Mon, 31 Jan 2011 19:52:36 -0200
> > To: hussamkibbi_at_hotmail.com
>
> >
> > 1- typically when you have several loopbacks and you want to make sure
> your ospf virtual-links will survive after any reload.
> >
> > 2- when you are using mbgp to communicate with several differents vrf's
> inside an mpls vpn core.
> >
> > 3- if you have one interface with ip unnumbered associated with a
> loopback and you advertise it into an igp of your choice, it will not only
> advertise the loopback but also the physical link itself, in other words,
> both will be reachable.
> >
> > Sent using my Iphone
> >
> > Em 31/01/2011, C s 15:21, Hussam EL Kebbi <hussamkibbi_at_hotmail.com>
> escreveu:
>
> >
> > > Hi experts,
> > >
> > > any idea?
> > >
> > > Thanks,
> > >
> > >
> > >
> > >> From: hussamkibbi_at_hotmail.com
> > >> To: ccielab_at_groupstudy.com
> > >> Subject: Router-ID & BGP address-family questions
> > >> Date: Mon, 31 Jan 2011 12:57:18 +0000
> > >>
> > >> Hi Experts,
> > >> I have 3 general questions:
> > >> 1 - When it is necessary to put router-id manually (whether OSPF,
> BGP)....?
> > >> during MPLS?MPBGP?IPv6....
> > >> 2 - when do we need to put under bgp: no bgp default ipv4-unicast ?
> and use
> > >> address-family ipv4?
> > >> 3 - if we have interface as ip unnumbered, can we include its subnet
> (taken
> > >> from loopback not in routing protocol) in routing protocol?
> > >> Please clarify these points!!!
> > >>
> > >> Thanks,
> > >>
> > >>
> > >> Blogs and organic groups at http://www.ccie.net
> > >>
> > >>
> _______________________________________________________________________
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> >
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> >
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Received on Tue Feb 01 2011 - 11:45:13 ART