Control-plane traffic is governed by pak_priority inside the router http://www.cisco.com/en/US/tech/tk543/tk544/technologies_tech_note09186a0080094612.shtml
This document is pretty old and doesn't reflect newer platforms, though basics remain the same I believe. Some little bit is also here: http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/WANQoS.html#wp96436 There are also recommendations how to treat CS6/CoS 6 traffic. On Thu, Mar 18, 2010 at 3:23 PM, Anton Kapela <[email protected]> wrote: > List, > > I've been trying to determine if c6500 pfc2/3 and msfc2/3 support > something like transmission priority for control-plane generated > protocols (layer2 and 3 control protocols, that is -- lldp, ospf, > isis, bgp, rsvp, stp, cdp, etc). I've read over this: > > "Egress LAN Port Scheduling.." > > http://www.cisco.com/en/US/docs/routers/7600/ios/12.2SXF/configuration/guide/qos.html#wp1698086 > > ...and can observe that, at least for switchports set to 'mode trunk,' > packets from the msfc2 or 3 are emitted with CoS 6 and 7 set, on > packets that are clearly OSPF and PIM hellos. My assumption is that I > can simply map CoS to queues (prio or regular) and assign a drop > threshold like I normally do, but is this a safe assumption? 2nd > question: is there already some "unconditional priority" queue hidden > from MLS or the MQC configuration which is uses to transmit > control-plane sourced messages? > > My recollection was that on sonet and various other lower-speed serial > lines, things like PPP LCP packets were unconditionally transmitted > head-of-line by whatever control plane was handling the port, ie. > rsp4, 2800, 7200, etc. > > Best, > > -Tk > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
