Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 896)

866 Multi-Service IronWare Switching Configuration Guide
53-1003036-02
MMRP networks
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Propagation of Group Membership
MMRP uses the Registration Entries in the Filtering Database to ensure that the frames are
transmitted to those ports on which group members are attached, thereby avoiding flooding of
these frames on all the ports.
Any node required to receive frames for this group has to declare the attribute. When a bridge is
required to receive frames for a group it will declare the group, membership to all the ports in the
VLAN based on the active topology, so that it sends this information to all connected nodes. Each
bridge receiving this declaration will register it on the incoming port and will in turn send it on all
other ports there by propagating the declaration to all the nodes in the LAN. Such propagation will
result in the formation of the reachability tree. When a bridge has to send frames to this particular
group, it will be sent to ports on which the registration entry exists.
Definition of MRP protocol elements
Use of MAP context
MMRP, as defined in the standard, operates within the set of VLAN Contexts that correspond to the
VLANs that are supported by the VLAN Bridged Local Area Network. The MAP Context Identifier
used to identify a VLAN Context shall be equal to the VID used to identify the corresponding VLAN.
The set of ports defined to be part of the active topology for a given VLAN Context shall be equal to
the set of ports for which the following are true:
• The port is a member of the member set of that VLAN; and
• The port is one of the ports that are part of the active topology for the spanning tree that
supports that VLAN.
Context identification in MMRP
The ingress rules for MMRPDUs on the port receiving such frames.
• MMRP frames with no VLAN classification (that is, untagged or priority-tagged MMRPDUs) are
discarded if the port is tagged port in the vlan.
• VLAN-tagged MMRP frames are classified according to the VID carried in the tag header.
• If the port is not in the member set for the MMRP frame's VLAN classification, then the frame is
discarded.
• MMRPDUs transmitted by MMRP Participants are VLAN classified according to the VLAN
Context associated with that Participant. The following rules apply when the MMRPDUs are
transmitted.
• MMRPDUs are transmitted through a given port only if the port is the member of the VLAN.
• MMRPDUs are transmitted as VLAN-tagged frames or as untagged frames in accordance with
the port is tagged or untagged Port for the VLAN concerned. Where VLAN-tagged frames are
transmitted, the VID field of the tag header carries the VLAN Context Identifier value.
MMRPDU
The MMRPDU frames will use the destination MAC of 00-00-00-00-00-20 and Ether-type of 88-F6
and protocol version of 0x00