[quagga-users 11293] Re: Stupid BGP question / problem

Stephan von Krawczynski skraw at ithnet.com
Mon Jan 4 22:54:21 GMT 2010


On Mon, 4 Jan 2010 14:23:04 -0700
"John Brown" <john at citylinkfiber.com> wrote:

> Hi Steve,
> 
> The Cisco is off on the edge because it is the "old core" router.
> 
> My intent is to have the following:
> 
> Two Cat 6509's each connected to the two dell's in a full mesh manner.
> 
> The Dell's will be the BGP speakers for the outside world and I want to
> run OSPF inside between the Dell's and the Cat 6509's
> 
> Then other servers, edge routers, etc will be either single attached to
> a single Cat 6509, or dual attached to both 6509's and we will run HSRP
> on those VLAN's.
> 
> The goal is that is Provider 1 or 2 fail, traffic still flows, if Dell 1
> or 2 fails, traffic still flows, if Cat-01 or 02 fails, traffic still
> flows....
> 
> I've moved all of our transit connections to Ethernet (no more POS / TDM
> / ATM) and the price/performance curve for OpenSource vis Cisco is HUGE.
> 
> How do I setup a reflector in bgpd ?


Simply add:

	neighbor <Cisco> route-reflector-client

to the neighbor setup on Dell-01.

People tend to make a big deal out of a single line ;-)

Regards,
Stephan



> 
> I have to do this in steps as it's a running network
> 
> Thanks
> 
> > -----Original Message-----
> > From: Steve Bertrand [mailto:steve at ibctech.ca]
> > Sent: Monday, January 04, 2010 2:15 PM
> > To: John Brown
> > Cc: quagga-users at lists.quagga.net
> > Subject: Re: [quagga-users 11288] Stupid BGP question / problem
> > 
> > John Brown wrote:
> > > Happy New Year folks,
> > >
> > > I say this is stupid because it is probably a simple setting or I'm
> > > forgetting something..
> > >
> > > Here is the environment.
> > >
> > > 1 Cisco 7507 router running BGP
> > >
> > > 2 Dell 2850's running FreeBSD / Quagga (latest version)
> > >
> > >
> > > Cisco ---> Dell-01 <----- Another Provider #1
> > >               |
> > >               |
> > >            Dell-02 <----- Another Provider #2
> > >
> > > Cisco, Dell-01 and Dell-02 are all in the same ASN
> > 
> > 
> > 
> > > Provider 1 and 2 are different providers
> > >
> > >
> > > I can bring BGP up from Cisco to Dell-01 (iBGP)
> > > I can bring BGP up from Dell-01 to Dell-02 (iBGP)
> > >
> > > The providers all come up as well (eBGP)
> > >
> > > The issue is that routes announced by Cisco to Dell-01 DO NOT
> > propagate
> > > to Dell-02
> > 
> > If the diagram above is really your setup, then iBGP-learnt routes
> from
> > Cisco to Dell-01 will not be sent from Dell-01 to Dell-02.
> > 
> > In order to make this work, you either need to create a full mesh of
> > your iBGP speakers (ie. Cisco will need to be peered with both of the
> > Dell boxes), or Dell-01 will need to become a reflector.
> > 
> > What is your Cisco's purpose in this case, and why is it off in the
> > corner, only peering with one Dell?
> > 
> > Steve
> 
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