The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Cisco ORF/BGP question
A BGP/ Outbound Route Filter question for the IOS/BGP cognescenti amongst the readers Assume MPLS VPNs running, Cisco IOS involved, particular routers not important. Assume PE1 is supporting 2 VPNs, Green_VPN and Blue_VPN Also assume on the network as a whole there is a Red_VPN supported by PE2. It is my understanding that, as part of the MP-BGPv4 functionality, at T0 (startup) all BGP VPNV4 speakers will issue updates to neighbors about all supported VPNs. Therefore PE1 will receive an update concerning the Red_VPN from PE2. Since PE1 doesn't need that update, it drops it and sends an ORF message to PE2. From that point on PE2 will not send Red_VPN updates to PE1. The question is this: In what way is this ORF applied within PE2? Does PE2 now hold two separate versions of the update, one for PE1 and a different one for other PEs? Or is the total list built and that particular part of the update stripped out of any update sent to PE1? Specific references would be most welcome. Thanks in advance Roger Williams ------- The MPLS-OPS Mailing List Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml Archive: http://www.mplsrc.com/mpls-ops_archive.shtml |
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