Hi, we will have multicast running over the MPLS VPN with ASR 9K as PE, CRS as P. I checked the ASR 9K multicast configuration guide v4.0 but didn't find any info for multicast load balancing. I found some old threads said we have to use GRE tunnel for this, but not sure if IOS XR could have any new features on it. Any suggestions?
Hi Vadim, thanks for your reply. The current network setup is CRS as P, C6500 and R7200 as PE. I can see following mdt config on PE router. I don't have any ideas for the multicast load-balancing, but seems current P and PE config doesn't have this function.
ip vrf xxx
mdt default 22.214.171.124
mdt data 126.96.36.199 0.0.0.255 threshold 400
mdt mtu 1476
ip multicast-routing vrf xxx
Now we are planning to replace all PEs with ASR 9K and building the lab to test. I just found this command 'multipath' under the multicast-routing on IOS XR. Does it only one command I need to enable the load-balancing for multicast on P and PE? Any other configuration we can try?
Yes, the multipath is the only command needed to enable the multicast load balancing in the core. The configuration allows multiple equal cost paths toward a PIM source or RP using a hash function based on a mcast Source and Group.
Note, as the balancing is based on S,G hashing, and in mVPN the address of a PE router would be always a source for the mdt, the balancing would be done based only on varying MDT data addresses.
For example, when PE1 start using 188.8.131.52 group, hashing based on (PE1,184.108.40.206) will be always the same, so if there are several end customers’ mcast groups use the same MDT, they’d use the same core path.
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