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Configuring Data-Link Switching Plus
DLSw+ Configuration Task List
BC-301
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
SNA Dial-on-Demand Routing
This feature allows you to run DLSw+ over a switched line and have the Cisco IOS software take the
switched line down dynamically when it is not in use. Utilizing this feature gives the IP Routing table
more time to converge when a network problem hinders a remote peer connection. In small networks
with good IP convergence time and ISDN lines that start quickly, it is not as necessary to use the
keepalive option. To use this feature, you must set the keepalive value to zero, and you may need to use
a lower value for the timeout option than the default, which is 90 seconds.
To configure SNA DDR, use the following command in global configuration mode:
The following command configures the SNA DDR feature:
dlsw remote-peer 0 tcp 10.2.13.4 keepalive 0
UDP Unicast Feature
The UDP Unicast feature sends the SSP address resolution packets via UDP unicast service rather than
TCP. (SSP packets include: CANUREACH_EX, NETBIOS_NQ_ex, NETBIOS_ANQ, and
DATAFRAME.) The UDP unicast feature allows DLSw+ to better control address resolution packets and
unnumbered information frames during periods of congestion. Previously, these frames were carried
over TCP. TCP resends frames that get lost or delayed in transit, and hence aggravate congestion.
Because address resolution packets and unnumbered information frames are not sent on a reliable
transport on the LAN, sending them reliably over the WAN is unnecessary. By using UDP for these
frames, DLSw+ minimizes network congestion.
Note UDP unicast enhancement has no affect on DLSw+ FST or direct peer encapsulation.
This feature is enabled by default. To disable User Datagram Protocol (UDP) Unicast, use the following
command in global configuration mode:
Command Purpose
Router(config)# dlsw remote-peer list-number tcp
ip-address [backup-peer [ip-address |
frame-relay interface serial number dlci-number
|
interface name]] [bytes-netbios-out
bytes-list-name] [circuit-weight weight]
[cluster cluster-id] [cost cost] [dest-mac
mac-address] [dmac-output-list
access-list-number] [host-netbios-out
host-list-name] [inactivity] [dynamic]
[keepalive seconds] [lf size] [linger minutes]
[lsap-output-list list] [no-llc minutes]
[passive] [priority] [rif-passthru
virtual-ring-number] [tcp-queue-max size]
[timeout seconds]
Configures SNA DDR.
Command Purpose
Router(config)# dlsw udp-disable
Disables UDP Unicast.