From: Gregory Gombas (ggombas@gmail.com)
Date: Wed Sep 26 2007 - 13:46:03 ART
The logic with ORF is a little confusing.
The sender is the one who sends the prefix list to the reciever.
So in your example R4 would be configured with the capability to send
the prefix list to R1.
The prefix list that is sent to R1 is specified by applying the prefix
list inbound on R4.
Example:
R1:
neighbor 155.1.146.4 capability orf prefix-list receive <--Configured
to recieve prefix list from R4.
R4:
neighbor 155.1.146.1 capability orf prefix-list send <-- Configured to
send prefix list to R1.
neighbor 155.1.146.1 prefix list DENY-ROUTES in <--This is the prefix
list that gets sent to R1.
HTH
On 9/26/07, John <jgarrison1@austin.rr.com> wrote:
> Unfortunatly this is the first time I've seen it. The lab I have has R1 as
> reciever and R4(155.1.146.4) as sender. when I look at the answer config is
> when I get confused. Why isn't the neighbor 155.1.146.4 the only commands
> under address-family(see below). are they saying it doesn't matter where I
> put my neighbor statements or is the config messed up. OT they have R4 set
> up to send a prefix-list that doesnt exist(annoying,but not a big deal)
>
> R1
> neighbor 155.1.13.3 remote-as 2
> neighbor 155.1.23.2 remote-as 2
> neighbor 155.1.146.4 remote-as 3
> address-family ipv4
> neighbor 155.1.13.3 activate
> neighbor155.1.13.3 next-hop-self
> neighbor 155.1.23.2 activate
> neighbor 155.1.23.2 next-hop-self
> neighbor 155.1.146.4 activate
> neighbor 155.1.146.4 capability orf prefix-list receive
> ----- Original Message -----
> From: "Joseph Brunner" <joe@affirmedsystems.com>
> To: "'John'" <jgarrison1@austin.rr.com>; "'Cisco certification'"
> <ccielab@groupstudy.com>
> Sent: Wednesday, September 26, 2007 9:55 AM
> Subject: RE: BGP ORF again
>
>
> > Its pretty simple; its an extended attribute that is shared to the
> > capability receiver from the capability sender.
> >
> > Its pretty easy to remember how to configure it also;
> >
> > I'm a sender, you're a receiver. I'll configure it the same way on me,
> > that
> > you would if you were allowed. I'll apply an inbound prefix list and it
> > will
> > magically work like you had applied it, even though all the configuration
> > must be done on me, except you are allowed to specify yourself as a
> > receiver
> > of orf.
> >
> > Don't worry too much about learning to be IOS XR BGP developer to pass the
> > lab. I get the BGP points in 10 or 15 minutes in there. The hard stuff is
> > less obvious in "easy" areas like reading English.
> >
> > -Joe
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > John
> > Sent: Wednesday, September 26, 2007 11:41 AM
> > To: Cisco certification
> > Subject: BGP ORF again
> >
> > I'm looking for explanations for ORF. All I can find on Cisco is the
> > command
> > refrence, which does nothing to help me understand whats going on. I can
> > "monkey" the lab, but I still don't really understand how/when to use the
> > commands in different situations. It is going to be added to TCP/IP Vol
> > 2's
> > next release, but it's not in this one. Anyhelp is greatly appreciated
> >
> > John
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sat Oct 06 2007 - 12:01:16 ART