Configuring Token Ring Vlans; Understanding Token Ring Trbrf Vlans; Understanding Token Ring Trcrf Vlans - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Catalyst 6000 series software configuration guide

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Configuring VLANs

Catalyst 6000 family switches do not support ISL-encapsulated Token Ring frames.

Token Ring Bridge Relay Function (TrBRF) VLANs interconnect multiple Token Ring Concentrator

Relay Function (TrCRF) VLANs in a switched Token Ring network (see

be extended across a network of switches interconnected through trunk links. The connection between

the TrCRF and the TrBRF is referred to as a logical port.

Figure 11-2 Interconnected Token Ring TrBRF and TrCRF VLANs

For source routing, the switch appears as a single bridge between the logical rings. The TrBRF can

function as a source-route bridge (SRB) or as a source-route transparent (SRT) bridge running either the

IBM or IEEE STP. If SRB is used, you can define duplicate MAC addresses on different logical rings.

The Token Ring software runs an instance of STP for each TrBRF VLAN and each TrCRF VLAN. For

TrCRF VLANs, STP removes loops in the logical ring. For TrBRF VLANs, STP interacts with external

bridges to remove loops from the bridge topology, similar to STP operation on Ethernet VLANs.

Certain parent TrBRF STP and TrCRF bridge mode configurations can place the logical ports (the

connection between the TrBRF and the TrCRF) of the TrBRF in a blocked state. For more

information, see the

For source routing, the switch appears as a single bridge between the logical rings. The TrBRF can

function as an SRB or SRT bridge running either the IBM or IEEE STP. If SRB is used, duplicate MAC

addresses can be defined on different logical rings.

To accommodate IBM System Network Architecture (SNA) traffic, you can use a combination of SRT

and SRB modes. In a mixed mode, the TrBRF considers some ports (logical ports connected to TrCRFs)

to operate in SRB mode while others operate in SRT mode.

Token Ring Concentrator Relay Function (TrCRF) VLANs define port groups with the same logical ring

number. You can configure two types of TrCRFs in your network: undistributed and backup.

"Default VLAN Configuration" section on page

Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4

Configuring Token Ring VLANs

11-2). The TrBRF can

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