Service Provider Bridging | 967To map C-Tag dot1p values to S-Tag dot1p values and mark the frames accordingly:Layer 2 Protocol TunnelingLayer 2 Protocol Tunneling (L2PT) is supported on platforms: c e sL2PT is supported on E-Series ExaScale ex with FTOS 8.2.1.0. and later.Spanning Tree BPDUs use a reserved destination MAC address called the Bridge Group Address, which is01-80-C2-00-00-00. Only spanning-tree bridges on the LAN recognize this address and process the BPDU.When VLAN stacking is used to connect physically separate regions of a network, BPDUs attempting totraverse the intermediate network might be consumed and subsequently dropped because the intermediatenetwork itself might be using Spanning Tree (Figure 46-13).Step Task Command Syntax Command Mode1 Allocate CAM space to enable queuingframes according to the C-Tag or theS-Tag.vman-qos: mark the S-Tag dot1p andqueue the frame according to the originalC-Tag dot1p. This method requires half asmany CAM entries as vman-qos-dual-fp.vman-qos-dual-fp: mark the S-Tag dot1pand queue the frame according to theS-Tag dot1p. This method requires twiceas many CAM entries as vman-qos andFP blocks in multiples of 2.cam-acl l2acl number ipv4acl numberipv6acl number ipv4qos number l2qosnumber l2pt number ipmacacl numberecfmacl number {vman-qos |vman-qos-dual-fp} numberDefault: 0 FP blocks for vman-qos andvman-qos-dual-fpCONFIGURATION2 The new CAM configuration is stored inNVRAM and takes effect only after a saveand reload.copy running-config startup-configreloadEXEC Privilege3 Map C-Tag dot1p values to a S-Tag dot1pvalue. C-Tag values may be separated bycommas, and dashed ranges are permitted.Dynamic Mode CoS overrides any Layer 2QoS configuration in case of conflicts.vlan-stack dot1p-mapping c-tag-dot1pvalues sp-tag-dot1p valueINTERFACENote: Since dot1p-mapping marks and queues packets, the only remaining applicable QoS configurationis rate metering. You may use Rate Shaping or Rate Policing.
