Users Guide

qos-policy-input 1 layer2
rate-police 10
!
qos-policy-input 3 layer2
rate-police 30
!
interface TenGigabitEthernet 1/21
no ip address
switchport
vlan-stack access
vlan-stack dot1p-mapping c-tag-dot1p 0-3 sp-tag-dot1p 7
service-policy input in layer2
no shutdown
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 conguration is stored in NVRAM and takes eect only after a save and reload.
EXEC Privilege mode
copy running-config startup-config
3. Reload the system.
reload
4. 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 conguration in case of conicts.
NOTE: Because dot1p-mapping marks and queues packets, the only remaining applicable QoS conguration 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 traverse the intermediate network might be
consumed and later dropped because the intermediate network itself might be using spanning tree (shown in the following
illustration).
776
Service Provider Bridging