From: John (jgarrison1@austin.rr.com)
Date: Wed Sep 26 2007 - 14:53:19 ART
I get that part. What I'm trying to understand is can I configure all the
rest of BGP in address-family mode like the example I had and I don't get
why they use the activate command for neighbors that aren't taking part in
ORF. I'm trying to figure out if the example I posted earlier is incorrect
and if so why
----- Original Message -----
From: "Gregory Gombas" <ggombas@gmail.com>
To: "John" <jgarrison1@austin.rr.com>
Cc: "Joseph Brunner" <joe@affirmedsystems.com>; "Cisco certification"
<ccielab@groupstudy.com>
Sent: Wednesday, September 26, 2007 10:46 AM
Subject: Re: BGP ORF again
> 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
>>
>> _______________________________________________________________________
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