Filter
Top Products
42-52
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 42 Configuring PFC QoS
PFC QoS Configuration Guidelines and Restrictions
• The QoS features implemented in the port ASICs (queue architecture and dequeuing algorithms)
support IPv4 and IPv6 traffic.
• The PFC3 supports IPv6 named extended ACLs and named standard ACLs.
• In Release 12.2(18)SXE and later releases, the PFC3 supports the match protocol ipv6 command.
• Because of conflicting TCAM lookup flow key bit requirements, you cannot configure IPv6
DSCP-based filtering and IPv6 Layer 4 range-based filtering on the same interface. For example:
–
If you configure both a DSCP value and a Layer 4 “greater than” (gt) or “less than” (lt) operator
in an IPv6 ACE, you cannot use the ACL for PFC QoS filtering.
–
If you configure a DSCP value in one IPv6 ACL and a Layer 4 “greater than” (gt) or “less than”
(lt) operator in another IPv6 ACL, you cannot use both ACLs in different class maps on the same
interface for PFC QoS filtering.
• In Release 12.2(18)SXE and later releases, you can apply aggregate and microflow policers to IPv6
traffic, but you cannot apply microflow policing to IPv6 multicast traffic.
• With egress ACL support for remarked DSCP configured, the PFC3 does not provide
hardware-assistance for these features:
–
Cisco IOS reflexive ACLs
–
TCP intercept
–
Context-Based Access Control (CBAC)
–
Network Address Translation (NAT)
• With a PFC3, you cannot apply microflow policing to ARP traffic.
• The PFC3 does not apply egress policing to traffic that is being bridged to the MSFC3.
• The PFC3 does not apply egress policing or egress DSCP mutation to multicast traffic from the
MSFC3.
• With a PFC3, PFC QoS does not rewrite the ToS byte in bridged multicast traffic.
PFC2 Guidelines
• The PFC2 supports the match protocol class map command, which configures NBAR and sends all
traffic on the Layer 3 interface, both ingress and egress, to be processed in software on the MSFC2.
To configure NBAR, refer to this publication:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t8/dtnbarad.htm
• The PFC2 does not support these PFC QoS features:
–
Egress policing
–
Egress DSCP mutation
–
DSCP Transparency
–
VLAN-based QoS with DFCs installed
• The PFC2 does not support the modules that support ingress CoS mutation on IEEE 802.1Q tunnel
ports.