The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] RE: MPLS load balancing
I've made them working with different IOS 12.2(2)T. I used 12.2(4)T1 for 7206VXR and 12.0(19)ST1 for GSR. Since this is a new feature, I'm just trying to see if anyone could help. I doubt TAC would help you on lab testing, they probably would, but I'm glad I just make it working by myself. regards, Raymond -----Original Message----- From: Robert Raszuk [mailto:raszuk@cisco.com] Sent: Friday, December 21, 2001 10:01 AM To: Ayush Sharma Cc: 'Raymond Cheung '; 'tpittman@frontrunner.eu.com '; ''Peter J. Welcher' '; 'mpls-ops@mplsrc.com ' Subject: Re: MPLS load balancing In the mean time when you assing different RD - RR simply does not compare the routes and send vpnv4 updates received from PE1 as well as from PE2 for the same prefix to PE3 just fine. Something must be misconfigured as this works just fine. Complaining that this is broken will not help to troubleshoot the issue. Pls open a TAC case and they will help you, R. > Ayush Sharma wrote: > > Hi Raymond > > By using the path attribute on RRs (only on Cisco)would force RR to send > all available paths instead of sending the best path. It is new feature and > cisco claims to make it available in early next year. > > Best Regards > > Ayush > > -----Original Message----- > From: Raymond Cheung > To: tpittman@frontrunner.eu.com; 'Peter J. Welcher'; mpls-ops@mplsrc.com > Sent: 20/12/2001 18:05 > Subject: RE: MPLS load balancing > > Peter, > Tim just explained exactly what I'm doing. Without RR in MPLS network, I > could have multipath for BGP if there are multiple IGP path to a PE. > With > RR, I can't make multipath work. Someone suggests using different RD for > same VPN (same route-target), but I can't make it working. I want to see > anyone have done this before. > best regards, > Raymond > > -----Original Message----- > From: tim pittman [mailto:tpittman@frontrunner.eu.com] > Sent: Thursday, December 20, 2001 AM 11:10 > To: 'Peter J. Welcher'; mpls-ops@mplsrc.com > Subject: RE: MPLS load balancing > > I think Rays issue is if a VPN destn. is actually reachable via two PE's > (PE1 and PE2). > eg a CE is dual homed to two PE's, PE1 and PE2. > > Then on PE3 because you can't iBGP load share via an RR, then only one > iBGP > route to the VPN destination (via either PE1 or PE2) is ever seen by > PE3. > The RR only passes on its best route. > > So doesn't matter that IGP on PE3 may then load share over differnet > internal paths > to reach either PE1 or PE2 , PE3 only ever sees one egress PE to reach > the > VPN destination. > > I guess iBGP load sharing without RR's would let PE3 see both PE1 and > PE2 as > equal > cost exit points and you could then use both, but don't think (with > cisco) > you can do it with RR's. > > tim > > -----Original Message----- > From: Peter J. Welcher [mailto:p.welcher@att.net] > Sent: 20 December 2001 13:25 > To: mpls-ops@mplsrc.com > Subject: MPLS load balancing > > Hi, Ray. I may be missing what you're trying to do, but > I suspect from the CE-CE you're trying to load balance > for MPLS VPN's. > > If you're doing MPLS VPN, BGP / MBGP is only used for the > next hop (exit from the SP cloud) determination. If the next > hop is a loopback on the PE router, the IGP is used for path > to that loopback. The IGP should load balance equal cost routes, > and MPLS label paths will also do this. > > HTH > > Raymond Cheung wrote: > > > > Hello, > > > > Has anyone tried BGP load balancing in a MPLS network with route > reflectors? > > I have no problem to get the load balancing working without route > > reflectors. But since route reflector can only advertise one best path > for > a > > prefix, so I have to use different RD to make vpnv4 addresses look > different > > on route reflectors. The problem is, after using different RD (still > same > > route-targets), CE-CE reachability is broken. > > Please let me know if you have done this.. > > Much appreciated. > > > > best regards, > > > > Raymond Cheung > > Senior Network Engineer (CCIE R&S) > > Schlumberger Network Solutions > > Tel: 713-513-3285 > > Tel: 713-513-3000 > > > ------------------------------------------------------------------ > Dr. Peter J. Welcher Home Office: (410) 626-7735 or 7122 > CCIE #1773, CCSI 94014 e-FAX: (208) 567-2310 > Chesapeake Netcraftsmen, Inc. EMAIL: pjw@netcraftsmen.net > 1290 Bay Dale Drive, #312 ALT EMAIL: p.welcher@att.net > Arnold, MD 21012-2325 //home.att.net/~p.welcher > CELL PHONE: (443) 995-4859 > > Chesapeake Netcraftsmen is a new consulting company dedicated to > quality. It is formed of ex-Chesapeake Computer Consultant and > Mentor Technologies employees with deep consulting and training > experience. We are currently 6 CCIE's. Our expertise includes > high-end routing and design, VoIP, QoS, MPLS, network management, > security, IP multicast, and other areas. > ------------------------------------------------------------------ > > ------- > The MPLS-OPS Mailing List > Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml > Archive: http://www.mplsrc.com/mpls-ops_archive.shtml > > ------- > The MPLS-OPS Mailing List > Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml > Archive: http://www.mplsrc.com/mpls-ops_archive.shtml > > ------- > The MPLS-OPS Mailing List > Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml > Archive: http://www.mplsrc.com/mpls-ops_archive.shtml > > ------- > The MPLS-OPS Mailing List > Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml > Archive: http://www.mplsrc.com/mpls-ops_archive.shtml ------- The MPLS-OPS Mailing List Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml Archive: http://www.mplsrc.com/mpls-ops_archive.shtml ------- 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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