Datasheet

112
Release Notes for Cisco IOS Release 12.1E on the Catalyst 6500 and Cisco 7600 Supervisor Engine and MSFC
OL-2310-11
Limitations and Restrictions
Workaround: Use a Flash PC card in slot0 to run these images and make sure there is at least 1 MB
free on the supervisor engine bootflash in case the system needs to save crash information.
(CSCdx48936)
• Traffic flow and SNMP connectivity is interrupted briefly if you perform an online insertion and
removal (OIR) that changes the number of fabric-enabled modules so that the switch must use a
different fabric channel switching mode. (CSCdx39882)
• The Ethernet port ASICs drop frames that are invalid (for example, frames that are shorter than the
minimum valid length). The Ethernet port ASICs do not keep a count of dropped frames.
(CSCdx14209)
• With Erasable Programmable Logic Device (EPLD) versions 0006 or earlier versions and
Release 12.1(8a)EX (and later 12.1 EX releases) or Release 12.1(11b)E (and later 12.1 E releases),
all CoS values for the Gigabit Ethernet ports on the Supervisor Engine 2 are mapped to queue 1,
threshold 1, by default and cannot be reconfigured. You cannot enter the following commands for
the Gigabit Ethernet Ports on the Supervisor Engine 2:
– wrr-queue cos-map
– rcv-queue cos-map
– priority-queue cos-map
This affects only the Gigabit Ethernet ports on the Supervisor Engine 2. It does not any affect other
ports on any other modules.
Workaround: Upgrade the EPLD. Contact the TAC for more information. (CSCdw89764)
• With Release 12.1(12c)E1 and later releases, you can enter the no mls qos channel-consistency
command to support an EtherChannel with QoS enabled that has interfaces with and without
strict-priority queues. In earlier releases, when you enable QoS, interfaces drop out of any
EtherChannels that contain both interface types.
• With a PFC2:
– Any options in Cisco IOS ACLs that provide filtering in a policy-map class that would cause
flows to be sent to the MSFC2 to be switched in software are ignored. For example, logging is
not supported in ACEs in Cisco IOS ACLs that provide filtering in QoS policy-map classes.
– The PFC2 does not provide QoS for flows that match an ACE in a Cisco IOS ACL configured
with options that cause the flows to be sent to the MSFC2 to be switched in software, except
when the Cisco IOS ACL provides filtering in a QoS policy-map class. For example, the PFC2
does not provide QoS for flows that match an ACE in a Cisco IOS ACL with logging configured.
(CSCds72804)
• For multicast flows, the PFC does not provide Layer 3 switching on output interfaces with MTU
sizes smaller than the flow’s input interface MTU size.
Workaround: Configure the same MTU size on both the input and output interfaces. (CSCds42685)
• Entering the clear mls qos command affects the policing token bucket counters and might briefly
allow traffic to be forwarded, which would otherwise be policed. (CSCdt40470)
• With a PFC2 and DFCs, you cannot attach QoS policies to VLANs; do not enter the mls qos
vlan-based command.
• The mls qos vlan-based command configures all interfaces on switching modules with
1p1q0t/1p3q1t QoS port architecture.