Cisco Systems BC-281 manual Configuring Advanced Features, BC-295

Configuring Data-Link Switching Plus

DLSw+ Configuration Task List

•Remote X.25-attached SNA devices can access an FEP or an AS/400 over a Token Ring or over SDLC.

For environments just beginning to migrate to LANs, our QLLC support allows deployment of LANs in remote sites while maintaining access to the FEP over existing NPSI links. Remote LAN-attached devices (physical units) or SDLC-attached devices can access a FEP over an X.25 network without requiring X.25 hardware or software in the LAN-attached devices. The Cisco IOS software supports direct attachment to the FEP over X.25 without the need for routers at the data center for SNA traffic.

To enable QLLC connectivity for DLSw+, use the following commands in interface configuration mode:

	Command	Purpose
Step 1
	Router(config-if)# encapsulation x	Specifies an interface as an X.25 device.
	25
Step 2
	Router(config-if)# x25 address	Activates X.25 subaddresses.
	subaddress
Step 3
	Router(config-if)# x25 map qllc	Associates a virtual MAC address with the X.121 address of the remote
	virtual-mac-addr x121-addr	X.25 device.
	[cud cud-value][x25-map-options]
Step 4
	Router(config-if)# qllc dlsw	Enables DLSw+ over QLLC.
	{subaddress subaddress pvc pvc-low
	[pvc-high]} [vmac vmacaddr
	[poolsize]] [partner
	partner-macaddr] [sap ssap dsap]
	[xid xidstring] [npsi-poll]

The following configuration enables QLLC connectivity for DLSw+:

dlsw local-peer peer-id 10.3.12.7 dlsw remote-peer 0 tcp 10.3.1.4 interface S0

encapsulation x25

x25 address 3110212011

x25 map qllc 1000.0000.0001 3 1104150101 qllc dlsw partner 4000.1151.1234

FDDI

Configure an FDDI interface the same as a Token Ring or Ethernet interface, depending on whether you are configuring SRB or Transparent Bridging. If you are configuring the router for SRB, configure the FDDI interface for Token Ring. If you are configuring the router for Transparent Bridging, configure the FDDI interface for Ethernet.

Configuring Advanced Features

DLSw+ goes beyond the standard to include additional functionality in the following areas:

•Scalability, page 296⎯Constructs IBM internetworks in a way that reduces the amount of broadcast traffic, which enhances their scalability.

•Availability, page 303⎯Dynamically finds alternate paths and, optionally, load-balances across multiple active peers, ports, and channel gateways.

	Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02		BC-295