Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 281)

Multi-Service IronWare Switching Configuration Guide 251
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Overview
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• ISID operation: A 24-bit ISID supports the provider bridging operation framework where an EVC
setup gives the closed environment for customer packets on the two ends to be limited to the
EVC. The EVC is identified by the ISID value.
• Customer MAC address learning is limited to the ISID domains that are part of an EVC. A PBB
device doesn't need to learn customer MAC addresses that are not part of this EVC. This
provides scalability, as devices are not required to store every customer MAC address that
passes through the provider backbone network.
• BVLAN: BVLAN provides the network connectivity among PBB nodes. Notice that while in a PB
network the SVLAN provides both the networking operation and service interconnection, in a
PBB network the service provisioning (ISID) is totally independent on networking framework
(BVLAN).
IEEE 802.1ah configuration options
Two types of architectures are possible for providing connectivity to PBB networks:
• Ingress ports receive SVLAN-encapsulated packets. In this case, the ingress port already
contains SVLAN mapping and the PBB system provides additional encapsulation for the PBB
header.
• Ingress ports directly connect to customer devices and receive CVLAN-mapped traffic. The
system then performs SVLAN mapping internally and then performs IEEE 802.1ah
encapsulation before sending packets out to PBB network. This model is not supported in
Brocade NetIron CES and Brocade NetIron CER.
Tag type configuration
Tag Type values for different encapsulations are defined globally for all types of VLANs.
At most, two different external tag-types can be defined for Brocade NetIron CES. The restriction of
two tag types doesn't include an additional tag-type that can be defined for ISID. ISID
encapsulation is performed internally and doesn't have a port association.
IEEE-defined tag-type values are as follows:
• CVLAN: 8100
• SVLAN & BVLAN: 88a8 (both PBB and PB bridges have identical outer tag-type so core PB
bridges process BVLAN tags and interoperate with PBB bridges)
• ISID: 88e7
When configuring tag types, all tag types must be entered in one command line, as shown below.
Brocade(config)# tag-type cvlan tag1 svlan tag2 bvlan tag2