Cisco 6500 Series Software Configuration Manual page 132
Hide thumbs
Also See for 6500 Series:
- Configuration manual (392 pages) ,
- Configuration note (212 pages) ,
- Installation manual (194 pages)
Table of Contents
Advertisement
Understanding How VLANs Work
Figure 9-1
Token
Ring
001
For source routing, the Catalyst 6500 series switch appears as a single bridge between the logical rings.
The TrBRF can function as a source-route bridge (SRB) or a source-route transparent (SRT) bridge
running either the IBM or IEEE STP. If an 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
Caution
connection between the TrBRF and the TrCRF) of the TrBRF in a blocked state. For more information,
see the
To accommodate IBM System Network Architecture (SNA) traffic, you can use a combination of SRT
and SRB modes. In a mixed mode, the TrBRF determines that some ports (logical ports connected to
TrCRFs) operate in SRB mode while other ports operate in SRT mode
Token Ring TrCRF VLANs
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.
TrCRFs typically are undistributed, which means each TrCRF is limited to the ports on a single network
device. Multiple undistributed TrCRFs on the same or separate network devices can be associated with
a single parent TrBRF (see
between the undistributed TrCRFs.
To pass data between rings located on separate network devices, you can associate the rings to the same
Note
TrBRF and configure the TrBRF for an SRB.
Catalyst 6500 Series Switch Cisco IOS Software Configuration Guide—Release 12.1 E
9-4
Interconnected Token Ring TrBRF and TrCRF VLANs
SRB or SRT
SRS
SRS
Token
Token
Ring
Ring
001
011
"VLAN Configuration Guidelines and Restrictions" section on page
Figure
BRF
CRF
SRS
Token
Token
Token
Ring
Ring
Ring
002
002
002
9-2). The parent TrBRF acts as a multiport bridge, forwarding traffic
Chapter 9
Configuring VLANs
9-8.
78-14099-04
Advertisement
Table of Contents
Troubleshooting
Related Manuals for Cisco 6500 Series
Related Products for Cisco 6500 Series
- Cisco 6503 - Catalyst Firewall Security Sys
- Cisco 6503-E - Catalyst Chassis With Supervisor Engine 32 Switch
- Cisco 6504-E - Catalyst Chassis With Supervisor Engine 32 Switch
- Cisco 6506 - Catalyst Chassis Switch
- Cisco 6513 - Catalyst Switch
- Cisco Catalyst 6509
- Cisco Catalyst 6513-E
- Cisco Catalyst 6500-E Series