Installation guide

Release Notes for Catalyst 6000 Family Software Release 5.x 9
Open Caveats in Software Release 5.3(4)CSX
• The ToS byte remains unchanged in bridged multicast packets when Multicast Multilayer
Switching (MMLS) is enabled. The system does not support multiple, different rewrites for a
single packet. The rewrite that is generated for multicast is a Layer 3 rewrite so there is no rewrite
for the Layer 2 forwarding.
For example, you have a multicast source in VLAN 13, a receiver in the same VLAN, and a QoS
IP ACL configured and mapped to the source's ingress port that matches the traffic flow and
specifies DSCP 31. When you disable the MMLS feature, the IP packets captured on the
receiver's port contain a ToS byte of x7C (the expected result). When you enable the MMLS
feature and establish a Layer 3 flow, the captured packet's ToS byte is unchanged from the value
sent by the source. A ToS rewrite occurs on the replicated packets in the outgoing VLANs (other
than VLAN 13). For the packets that are bridged in the same incoming VLAN, no ToS rewrite
occurs. (CSCdm72364)
• The RSVP access control entry (ACE) does not attach over an EtherChannel port if the QoS
policy for ports forming the channel are set at different times. The workaround is to execute the
steps that cause the problem in a different order. Consider that ports 4/1-8 are to be channeled
and have identical role combinations:
— set port qos 4/1 policy local
— set qos acl map acl1 4/1
— set qos policy cops
— set port qos 4/1 policy cops
— set port channel 4/1-8 des
The above sequence of steps causes the problem. The following fix ensures that you never map
different ACLs to different ports which might channel together and later switch them to all map
to the same ACL.