My 2 core routers have total 3 links . Now I want them to enable MPLS ip on their interfaces as P routers, but I am not sure if I should enable on all 3 pairs of interfaces and how it loads sharing MPLS traffic on them . My core routers are running EIGRP now. Please advice ! Thanks !
MPLS loadsharing is indeed possible. If the packets being carried on top of MPLS are IPv4 then the hashing algorithm, to select the outbound interface, is based on the IPv4 source and destination addresses.
Otherwise, the inner label (bottom of stack) is used by the hashing algorithm to determine the outbound interface.
Hope this helps,
Harold Ritter Sr. Technical Leader CCIE 4168 (R&S, SP) email@example.com México móvil: +52 1 55 8312 4915 Cisco México Paseo de la Reforma 222 Piso 19 Cuauhtémoc, Juárez Ciudad de México, 06600 México
As I get from your msg , for my scenario , when enable MPLS ip on all 3 pairs of interface (3 links between 2 P routers) . The MPLS loadsharing is then like that of a etherchannel , am I wrong ? and does my EIRGP routing have any effect on packet forwarding interface selection ?
Hi, just for clarification, what Harold wrote is the hashing algorithm used with CEF forwarding of labeled packets. Per default it is (IP) destination based. If there is no IPv4 header detectable (f.e. EoMPLS), then the bottom label is used by CEF to forward labeled packets.
All this is done to avoid packet reordering problems.
Path selection in the MPLS core is based on your IGP, this is, what olorunloba wrote. For PE to PE traffic in most cases IGP paths to BGP next-hop addresses are used for load sharing across different pathes.
So both answers above contain part of the whole picture.
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