Cisco Systems BC-109 Bedienungsanleitung Seite 7
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Enable the Automatic Spanning-Tree Function
Configuring Source-Route Bridging BC-115
Forwarding all-routes explorer packets is the default. However, in complicated source-route bridging
topologies, using this default can generate an exponentially large number of explorers that are
traversing the network. The number of explorer packets becomes quite large because duplicate
explorer packets are sent across the network to every node on every path. Eventually each explorer
packet will reach the destination device. The destination device will respond to each of these
explorer packets. It is from these responses that the source device will collect the RIF and determine
which route it will use to communicate with the destination device. Usually, the route contained in
the first returned response will be used.
The number of explorer packets traversing the network can be reduced by sending spanning-tree
explorer packets. Spanning-tree explorer packets are sent to specific nodes; that is, to only the nodes
on the spanning tree, not to all nodes in the network. You must manually configure the spanning-tree
topology over which the spanning-tree explorers are sent. You do this by configuring which
interfaces on the routers will forward spanning-tree explorers and which interfaces will block them.
To enable forwarding of spanning-tree explorers on an outgoing interface, use the following
command in interface configuration mode:
Note While enabling the forwarding of spanning-tree explorer packets is not an absolute
requirement, it is strongly recommended in complex topologies. Configuring an interface to block
or forward spanning-tree explorers has no effect on how that interface handles all-routes explorer
packets. All-routes explorers can always traverse the network.
To block forwarding of spanning tree explorers on an outgoing interface, use the following command
in interface configuration mode:
Enable the Automatic Spanning-Tree Function
The automatic spanning-tree function supports automatic resolution of spanning trees in SRB
networks, which provides a single path for spanning explorer frames to traverse from a given node
in the network to another. Spanning explorer frames have a single-route broadcast indicator set in
the routing information field. Port identifiers consist of ring numbers and bridge numbers associated
with the ports. The spanning-tree algorithm for SRB does not support Topology Change Notification
bridge protocol data unit (BDPU).
Note Although the automatic spanning-tree function can be configured with source-route
translational bridging (SR/TLB), the SRB domain and transparent bridging domain have separate
spanning trees. Each Token Ring interface can belong to only one spanning tree. Only one bridge
group can run the automatic spanning-tree function at a time.
Command Purpose
source-bridge spanning Enable the forwarding of
spanning-tree explorer packets on an
interface.
Command Purpose
no source-bridge spanning Block spanning-tree explorer packets
on an interface.
- SRB Configuration Task List 1
- Configure SRB over FDDI 5
- Limit the Maximum SRB Hops 8
- Source-route bridged 9
- Token Ring network 9
- Configure a Static RIF Entry 10
- Environments 11
- • Enable 0x80d5 Processing 14
- Configure NetBIOS Support 15
- Enable NetBIOS Proxying 17
- Configure LNM Support 18
- How a Router Works with LNM 20
- Command Purpose 21
- Enable LNM Servers 23
- Change Reporting Thresholds 23
- Monitor LNM Operation 24
- Secure the SRB Network 25
- • Token Ring vendor code 27
- • Source address 27
- • Destination address 27
- Filter Frames by Vendor Code 28
- Filter Source Addresses 28
- Filter Destination Addresses 28
- • LSAP and SNAP type codes 29
- • MAC addresses 29
- • NetBIOS station names 29
- Configure Access Expressions 30
- Optimize Access Expressions 30
- Tune the SRB Network 31
- Enable or Disable the SSE 33
- Optimize Explorer Processing 33
- Station X 34
- Station Z 34
- Router A Router B 34
- Implementations 35
- SRB Configuration Examples 37
- SRB-Only Example 39
- Multiport SRB Example 40
- Configuration for Router A 41
- Configuration for Router B 42
- Router A 42
- Router B 42
- FRAD B FRAD C 43
- Configuration of Router A 44
- Configuration on Router B 44
- Configuration on Router C 44
- Bridge 1 45
- 1000.5A12.3456 45
- Logical configuration 49
- Rings 2 and 3 53
- Access Filters Example 55
- Autonomous Switching Example 56
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