From: Chua, Parry (Parry.Chua@xxxxxxxxxx)
Date: Fri Mar 01 2002 - 03:44:42 GMT-3
The following are the ways that we can configuue the BGP to advertise 0/0(defau
lt route) to it peers :
1. You don't have a default route in routing table, use "neigh xxxx default-inf
ormation orginate"
BGP xxx
neigh a.b.c.d default-information orginate
neigh e.f.g.h default-information orginate
2. You have a default route in routing table, two choice :
2.1---- use network 0.0.0.0 in BGP.
2.2.1- Redistribute route to BGP , but BGP does not allowed network 0.0.0.0 ,
so you need command,
2.2.2- default-information in BGP will advertise 0/0 to all peers.
3. You have a default route adverise by your BGP peers
- Do nothing, it continues to advertise to other BGP peers.
There are other ways to control advertise and propagation of default route, fur
ther details is in IRA and CCO..
Parry Chua
-----Original Message-----
From: A Yigit Zorlu [mailto:alec_cisco@yahoo.com]
Sent: Thursday, February 28, 2002 9:34 PM
To: Chua, Parry; 'Tshon'; 'Jason Sinclair'
Cc: ccielab@groupstudy.com
Subject: RE: BGP default inf orig vs. redist static default route
AFAIK Without having a static default route def-in-orig can do nothing. So I
will conclude like this;
If you have a static default route in your BGP router and you want to to be
advertised to your BGP peers
1. either redistribute this default route with redistribute static command
2. or configure default-information-originate under your router's BGP
process.
Do you agree ?
Yigit
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Chua, Parry
Sent: Thursday, February 28, 2002 11:45 AM
To: A Yigit Zorlu; Tshon; Jason Sinclair
Cc: ccielab@groupstudy.com
Subject: RE: BGP default inf orig vs. redist static default route
You may want to verify :
1. In your router, if there is a default route, next at BGP process, try
default-information orginate, now show ip bgp,
do you see 0.0.0.0 advertise ?
2. Remove the default route, do you still see (show ip bgp) BGP advertise
0.0.0.0 to it peers ?
>From the DIC CD, it stated that default-information orginate a network
0.0.0.0 to BGP.
If in BGP, you configure neigh xxxx default-information orginate, you ask
BGP to advertise a 0/0 to that peer
uncondition.
Parry Chua
-----Original Message-----
From: A Yigit Zorlu [mailto:alec_cisco@yahoo.com]
Sent: Thursday, February 28, 2002 5:07 PM
To: 'Tshon'; 'Jason Sinclair'
Cc: ccielab@groupstudy.com
Subject: RE: BGP default inf orig vs. redist static default route
Hi all,
Actually I know the neighbor defaul-originate command, I use it , and I am
happy about it. My question is
If I have a static default route in my BGP router I need to configure
redistribute static under BGP so IBGP peers will be able to see it. So why
do I need defaul-information -originate under BGP ? Is an alternative to
redistribute static solution? In addition is there any specific case that
default-information-originate command usage is MUST?
Can I always get the same result if I do redistribute static of 0/0 route
instead of using def-inf-orig command ?
Regards,
Yigit
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of Tshon
Sent: Thursday, February 28, 2002 3:49 AM
To: Jason Sinclair
Cc: 'A Yigit Zorlu'; ccielab@groupstudy.com
Subject: Re: BGP default inf orig vs. redist static default route
See if this explains your problem.
If you have a static default configured locally or are recieving a
default route via BGP. The router will not pass
to other IBGP routers that they have a default route. So you need the
Default information originate to pass
it along. Which is the same as redistributing the static.
Now, what I think in reading you question, is that you might really
be trying to figure out why receive a default
route via BGP instead of entering a static route? Is that more in line
with your question? Or did the first part help?
Jason Sinclair wrote:
>What about if you are receiving a default route via bgp and wish to onwards
>advertise this route? Without this command you would have this route
>locally, however you would not advertise this to any peer.
>
>Regards,
>
> -----Original Message-----
> From: A Yigit Zorlu [mailto:alec_cisco@yahoo.com]
> Sent: Thursday, 28 February 2002 08:51
> To: ccielab@groupstudy.com
> Subject: BGP default inf orig vs. redist static default route
>
> Hi gang,
>
> As far as I understand default-information-originate allows default
>route to
> be advertised inside BGP. It does not create a default route. So why
>do I
> need that command ? Instead, I can configure a static default route
>and
> redistribute it into BGP. Still could not find a reason or a case to
>use
> default-information-originate command under BGP.
>
> Regards,
>
> Yigit
>
>
>
>
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