From: Cecil Wilson (Cecil.Wilson@flextronics.com)
Date: Mon Sep 17 2007 - 13:57:46 ART
Thanks Joe
Cecil G. Wilson
IT Network Services
Office: (901) 215-2710
Cell: (901) 601-6201
cecil.wilson@flextronics.com
-----Original Message-----
From: Joe Mama [mailto:jsmith1234550@gmail.com]
Sent: Monday, September 17, 2007 11:46 AM
To: Cecil Wilson
Cc: Prashant Shukla; Ashok CCIE; ccielab@groupstudy.com
Subject: Re: BGP over Frame-relay
Cecil, Depending on what is being asked of you, peering via loopbacks
may not be prefereable as it will take in to account multiple paths to
reach the neighbor.
With iBGP peers, this may be fine (and normally is), but with eBGP peers
especially on a lab-type of scenario, would you want your AS to try
multiple IGP paths to a neighbor in another AS or just use rdundant eBGP
exit points (in a normal failover scenario)?
So, via iBGP, loopback is a sound move most times. eBGP peering via a
loopback may not always be the most sound move (especially in a lab-type
of environment that will have IGPs knowing all of the routes of the
other ASs via redistribution (rather than controlling all AS route
propogation via eBGP.
Joe
On 9/12/07, Cecil Wilson <Cecil.Wilson@flextronics.com> wrote:
> This maybe easy but which interface is consider the outgoing
>
> interface IP?
>
> Is it the directly connected interface? What happens when the
>
> router has multiple routes to a subnet?
>
> Thanks for all input
>
>
>
>
>
> Cecil G. Wilson
>
> IT Network Services
>
> Office: (901) 215-2710
>
> Cell: (901) 601-6201
>
> cecil.wilson@flextronics.com
>
>
>
>
>
> -----Original Message-----
>
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
>
> Prashant Shukla
>
> Sent: Wednesday, September 12, 2007 8:49 AM
>
> To: 'Ashok CCIE'; ccielab@groupstudy.com
>
> Subject: RE: BGP over Frame-relay
>
>
>
> Ashok,
>
>
>
> It seems you are using the loopback to peer with your I/E-BGP peers
> and
>
> the configs do not mention the "update-source" cmd.
>
>
>
> By default , if the update-source is not mentioned the peering is done
>
> using the outgoing interface's IP .
>
>
>
> Here it seems in the BGP peering the routers are expecting the source
> of
>
> the BGP TCP connection to be interface IPs rather that loop backs.
>
> (default).
>
>
>
> Would recommend using update-source with peers and Im sure the peering
>
> will be up.
>
>
>
> Have burnt my hands in the past with same.
>
>
>
>
>
> Shukla.
>
> Cisco Systems.
>
> Scott Morris <swm@emanon.com> wrote: Take a look at "debug ip packet"
>
> perhaps and you may find that the packets are coming from an IP
> address
>
> that the other side doesn't have listed in its neighbor table. (e.g.
>
> update-source)
>
>
>
>
>
> -----Original Message-----
>
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
>
> Ashok CCIE
>
> Sent: Wednesday, September 12, 2007 7:27 AM
>
> To: ccielab@groupstudy.com
>
> Subject: BGP over Frame-relay
>
>
>
> Hi Team,
>
>
>
> I am configuring IBGP b/w loopback interfaces of two interfaces which
>
> are over Frame-relay. But my routers are not making any neighbor
>
> relationship.
>
> Why so?
>
>
>
> Config is here..
>
>
>
> R1
>
>
>
> router bgp 100
>
> no synchronization
>
> bgp router-id 2.2.2.1
>
> bgp log-neighbor-changes
>
> network 1.1.1.0 mask 255.255.255.0
>
> network 2.2.2.1 mask 255.255.255.255
>
> neighbor 2.2.2.2 remote-as 100
>
> neighbor 2.2.2.2 next-hop-self
>
> neighbor 2.2.2.3 remote-as 100
>
> neighbor 2.2.2.3 next-hop-self
>
> no auto-summary
>
>
>
> R2
>
>
>
> router bgp 100
>
> no synchronization
>
> bgp router-id 2.2.2.2
>
> bgp log-neighbor-changes
>
> network 1.1.1.0 mask 255.255.255.0
>
> network 2.2.2.2 mask 255.255.255.255
>
> neighbor 2.2.2.1 remote-as 100
>
> neighbor 2.2.2.1 ebgp-multihop 255
>
> no auto-summary
>
>
>
>
>
> Could you please help?
>
>
>
> Thanks,
>
> Ashok
>
>
>
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