Administrator Guide

Mapping C-Tag to S-Tag dot1p Values
To map C-Tag dot1p values to S-Tag dot1p values and mark the frames accordingly, use the following
commands.
1 Allocate CAM space to enable queuing frames according to the C-Tag or the S-Tag.
CONFIGURATION mode
cam-acl l2acl number ipv4acl number ipv6acl number ipv4qos number l2qos number
l2pt number ipmacacl number ecfmacl number {vman-qos | vman-qos-dual-fp} number
• vman-qos: mark the S-Tag dot1p and queue the frame according to the original C-Tag dot1p. This
method requires half as many CAM entries as vman-qos-dual-fp.
• vman-qos-dual-fp: mark the S-Tag dot1p and queue the frame according to the S-Tag dot1p.
This method requires twice as many CAM entries as
vman-qos and FP blocks in multiples of 2.
The default is: 0 FP blocks for vman-qos and vman-qos-dual-fp.
2 The new CAM configuration is stored in NVRAM and takes effect only after a save and reload.
EXEC Privilege mode
copy running-config startup-config reload
3 Map C-Tag dot1p values to a S-Tag dot1p value.
INTERFACE mode
vlan-stack dot1p-mapping c-tag-dot1p values sp-tag-dot1p value
Separate C-Tag values by commas. Dashed ranges are permitted.
Dynamic Mode CoS overrides any Layer 2 QoS configuration in case of conflicts.
NOTE: Because dot1p-mapping marks and queues packets, the only remaining applicable QoS
configuration is rate metering. You may use Rate Shaping or Rate Policing.
Layer 2 Protocol Tunneling
Spanning tree bridge protocol data units (BPDUs) use a reserved destination MAC address called the bridge
group address, which is 01-80-C2-00-00-00.
Only spanning-tree bridges on the local area network (LAN) recognize this address and process the BPDU.
When you use VLAN stacking to connect physically separate regions of a network, BPDUs attempting to
Service Provider Bridging 824