
© 2012 Cisco and/or its affiliates. All rights reserved.
Presentation_ID
Cisco Public
© 2013 Cisco and/or its affiliates. All rights reserved.
BRKARC-3470 Cisco Public
41
Central Arbitration
• Access to fabric for unicast traffic controlled using central arbitration
‒ Ensures fair access to available bandwidth on each egress port
‒ Can provide no-drop service for some traffic classes
• Arbiter ASIC on Supervisor Engine provides central arbitration via
dedicated arbitration path to every module
• Arbitration performed on per-destination, per-priority basis
‒ Ensures high priority traffic takes precedence over low priority traffic
• For multidestination traffic, no central arbitration
‒ Ingress broadcast, multicast, unknown unicast frames sent unarbitrated
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