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Tune the SRB Network
BC-140
Bridging and IBM Networking Configuration Guide
Enable or Disable the Source-Route Fast-Switching Cache
Rather than processing packets at the process level, the fast-switching feature enables the Cisco IOS
software to process packets at the interrupt level. Each packet is transferred from the input interface
to the output interface without copying the entire packet to main system memory. Fast switching
allows for faster implementations of local SRB between 4/16-MB Token Ring cards in the same
router, or between two routers using the 4/16-Mb Token Ring cards and direct encapsulation.
By default, fast-switching software is enabled when SRB is enabled. To enable or disable
source-route fast-switching, use one of the following commands in interface configuration mode:
Note Using either NetBIOS Byte Offset access filters or access expressions that combine access
filters disables the fast switching of source-route bridging frames.
Enable or Disable the Source-Route Autonomous-Switching Cache
Autonomous switching is a feature that enables the Cisco IOS software to transmit packets from the
input ciscoBus card to the output ciscoBus card without any involvement on the part of the router
processor.
Autonomous switching is available for local SRB between ciscoBus Token Ring (CTR) cards in the
same router. Autonomous switching provides higher switching rates than does fast switching
between 4/16-Mb Token Ring cards. Autonomous switching works for both two-port bridges and
multiport bridges that use ciscoBus Token Ring cards.
In a virtual ring that includes both ciscoBus Token Ring and 4/16-Mb Token Ring interfaces, frames
that flow from one CTR interface to another are autonomously switched, and the remainder of the
frames are fast switched. The switching that occurs on the CTR interface takes advantage of the
high-speed ciscoBus controller processor.
To enable or disable source-route autonomous switching, use one of the following commands in
interface configuration mode:
Note Using either NetBIOS Byte Offset access filters or access-expressions that combine access
filters disables the autonomous switching of SRB frames.
Command Purpose
source-bridge route-cache Enable fast-switching.
no source-bridge route-cache Disable fast-switching.
Command Purpose
source-bridge route-cache cbus Enable autonomous switching.
no source-bridge route-cache cbus Disable autonomous switching.
- 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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