I have my first QoS policy to write for ASR9000 running MPLS VPN, and have a few questions.
The requirement is to protect router control plane traffic on the egress links (PE-PE/P) from user traffic for a throughput test. Currently, if I load up the router with simulated customer traffic from a test set not surprisingly I can get BFD etc to run into problems when the PE-P egress load approaches 100% utilisation.
I need to protect ISIS, BGP, LDP and BFD from the user traffic.
So far I understand ISIS uses CLNS so falls outside of MQC and IP QoS, this is prioritised by an internal process on the router. Do I have to do anything else to protect the ISIS traffic?
Can I mark BGP, LDP and BFD within the appropriate configuration sections in the router, or do I have to use ACL's class-maps etc to mark packets generated by the router?
I'll be plowing through the QoS guide and the documents on this forum again today, any head up info appreciated.
For routing protocols like ISIS, BGP, OSPF and LDP for MPLS you dont need to set the QoS class manually, this is done automatically. Nevertheless, in your outgoing service policy you still need to do the bandwidth allocation for that. You implement this by matching on EXP 6 and EXP 7 if you run MPLS on the interface or by matching on PREC 6 and PREC 7 on interfaces running plain IP. After matching the control traffic you allocate e.g. a minimum interface bandwidth of 1%, depending on how much control traffic you expect. Normally on Gig and 10Gig interfaces, 1% is sufficient IMHO.
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