SRR question

[Volodymyr Khrystenko]

In Cisco press is written that traffic with CoS=6,7 will be dropped when ingress queues are full. Does this mean that STP may suffer or CDP? Are there any mechanism to protect control traffic?

[Edison Ortiz]

In addition to QoS, there is another element called pak_priority.

This article goes over in detail:

http://www.cisco.com/en/US/tech/tk543/tk544/technologies_tech_note09186a0080094612.shtml

[Joseph W. Doherty]

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Posting

Some devices provide SPD (selective packet discard); to favor "important" ingress packets, i.e. provide some additional ingress queue elements for those.

[paul driver]

Hello

You don't say what switch model your are using but regards 3550 I assume this would not be case as its priority queue holds these cos settings?
Maybe Joseph and Edison could clarify this?

3550 -WRR
-the default priority queue is q4 ( cos6/7) q3 (cos4/5)

3560/3750 -SRR
- the default priority queue is q1 (cos5) q4(cos4/6/7)

Res
Paul

Sent from Cisco Technical Support iPad App

[Volodymyr Khrystenko]

STP or CDP traffic is marked with CoS=6 or 7? I dont get this moment. BPDUs are marked?