I think you really need to mention that you are working on describing RFC2547bis which happens to use MPLS as a forwarding mechanism. The original question asked why BGP was required for MPLS for which the correct answer is that it isn't.
At 11:05 AM 3/21/2002 -0500, Sexton, Ken wrote: >MP-iBGP (Multi-Protocol iBGP) is used because it has community extensions >inherent to the routing protocol, to pass VPN related information among the >PE (Provider Edge) routers. Using Extended Communities VPN related >information such as, Route Target (RT), Site of Origin (for dual home CEs) >as well as VPNv4 information can be passed among iBGP peers. Because this is >an iBGP environment, all PEs will receive route updates from everyone else. >(You can use route reflectors to lessen the peer statements). The iBGP >environment requires that all PEs be in sync (global table). The import >statements within the VRF determine which routes to take out of the BGP >global table and install into the VRF routing table. The export statements >indicate which VRF routes will be exported to your iBGP peers. > >You can use an underlying IGP to establish your peers (nothing different >than dealing with normal iBGP). OSPF and IS-IS are the most common IGPs as >they provide addtional hooks within the IOS code to support additional >features such as traffic engineering (examples: support for RSVP, CR-LDP), >etc. > >Ken Sexton >Data Network Engineering >ICG Communications >[EMAIL PROTECTED] > > > > >-----Original Message----- >From: thinkworker [mailto:[EMAIL PROTECTED]] >Sent: Thursday, March 21, 2002 3:58 AM >To: [EMAIL PROTECTED] >Subject: Re[2]: Why we need BGP to establish MPLS? [7:39014] > > >It seems I had to use IBGP to establish MPLS, so can u explain how can >we setup a MPLS network without BGP? Or maybe U mean using the static >route? > >I should check the book I've got called "MPLS & VPN Architecture & >Implement" of Cisco press (though it is translated very poor) but I had >not the book in my hand:( > > > >By the way, is the book outdated? > >On Thu, 21 Mar 2002 03:19:34 -0500 >"nrf" wrote: > > > You don't need BGP to establish MPLS. > > > > On the other hand, you might need BGP to enable certain 'value-added' MPLS > > applications. > > > > > > ""thinkworker"" wrote in message > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > > Why we need BGP to establish MPLS? > > > > > > Now we had to use IGP and IBGP to set up MPLS in a AS. It seems quite > > > not necessary. > > > > > > Can anyone help? Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=39051&t=39014 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
