Configure Source-Route Bridging
Configure Fast-Switching SRB over FDDI
Fast-Switching SRB over FDDI enhances performance. For example, if you want to use access-lists, fast-switching SRB over FDDI provides fast performance and access-list filters capability.
To configure fast-switching SRB over FDDI, use the following commands, beginning in global configuration mode:
Step | Command | Purpose |
1 | interface fddi slot/port | Configure an FDDI interface. |
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2 | source-bridgelocal-ring bridge-number | Enable source-route bridging. |
| target-ring | |
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3 | source-bridge spanning | Enable source-bridge spanning. |
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4 | source-bridge route-cache | Enable fast-switching. |
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5 | multiring protocol-keyword | Enable the collection and use of RIF |
| | information. |
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Configure SRB over Frame Relay
Cisco IOS software offers the ability to encapsulate source-route bridging traffic using RFC 1490 Bridged 802.5 encapsulation. This provides SRB over Frame Relay functionality that is interoperable with other vendors’ implementations of SRB over Frame Relay and with some vendors’ implementations of FRAS BAN.
Note In the initial release, SRB over Frame Relay does not support the Cisco IOS software proxy explorer, automatic spanning-tree, or LAN Network Manager functions.
To configure SRB over Frame Relay, use the following commands in interface configuration mode:
Step | Command | Purpose |
1 | interface serial number | Specify the serial port. |
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2 | encapsulation frame-relay | Enable Frame Relay encapsulation. |
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3 | interface serial slot/port.subinterface-number | Configure a Frame Relay |
| point-to-point | point-to-point subinterface. |
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4 | frame-relay interface-dlci dlci ietf | Configure a DLCI number for the |
| | point-to-point subinterface. |
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5 | source-bridgesource-ring-number bridge-number | Assign a ring number to the Frame |
| target-ring-number conserve-ring | Relay permanent virtual circuit. |
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Enable the Forwarding and Blocking of Spanning-Tree Explorers
When trying to determine the location of remote destinations on a source-route bridge, the source device will need to send explorer packets. Explorer packets are used to collect routing information field (RIF) information. The source device can send spanning-tree explorers or all-routes explorers. Note that some older IBM devices generate only all-routes explorer packets, but many newer IBM devices are capable of generating spanning-tree explorer packets.
A spanning-tree explorer packet is an explorer packet that is sent to a defined group of nodes that comprise a statically configured spanning tree in the network. In contrast, an all-routes explorer packet is an explorer packet that is sent to every node in the network on every path.
BC-114Bridging and IBM Networking Configuration Guide
