user manual

Configuring Data-Link Switching Plus
DLSw+ Configuration Task List
BC-295
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
• 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:
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.
Command Purpose
Step 1
Router(config-if)# encapsulation x
25
Specifies an interface as an X.25 device.
Step 2
Router(config-if)# x25 address
subaddress
Activates X.25 subaddresses.
Step 3
Router(config-if)# x25 map qllc
virtual-mac-addr x121-addr
[cud cud-value] [x25-map-options]
Associates a virtual MAC address with the X.121 address of the remote
X.25 device.
Step 4
Router(config-if)# qllc dlsw
{subaddress subaddress | pvc pvc-low
[pvc-high]} [vmac vmacaddr
[poolsize]] [partner
partner-macaddr] [sap ssap dsap]
[xid xidstring] [npsi-poll]
Enables DLSw+ over QLLC.