Troubleshooting Dlsw; Unable To Establish A Tcp Connection - 3Com MSR 50 Series Configuration Manual

232 C 7: DLS C
HAPTER W ONFIGURATION
[RouterA] interface ethernet 1/1
[RouterA-Ethernet1/1] bridge-set 1
[RouterA-Ethernet1/1] quit
# Enable multicast.
[RouterA] multicast routing-enable
[RouterA] interface ethernet 1/0
[RouterA-Ethernet1/0] pim dm
[RouterA-Ethernet1/0] igmp enable
[RouterA-Ethernet1/0] igmp static-group 224.0.10.0
[RouterA-Ethernet1/0] quit
# Configure local DLSw peers, configure the permit-dynamic keyword to allow a
remote peer that is not preconfigured to initiate a TCP connection for dynamic
remote peer creation.
[RouterA] dlsw local 1.1.1.1 permit-dynamic
# Enable DLSw multicast, set the maximum number explorer retries and specify a
local bridge set.
[RouterA] dlsw multicast interface ethernet 1/0
[RouterA] dlsw max-transmission 3
[RouterA] dlsw bridge-set 1
2 Configure Router B and Router C
Before configuring Router B and Router C, first make sure of which DLSw version
they support. If they are DLSw v2.0 capable, the configuration is similar as on
Router A; if they are DLSw v1.0 capable, remove the multicast and explorer frame
retransmission part from the configuration.
For the configuration on the Cisco router, refer to Cisco documentation.

Troubleshooting DLSw

Proper communication of the DLSw needs sound cooperation between the
involved SNA devices and DLSw-capable routers. A fault in the cooperation
between any two nodes may cause connection failure.
Unable to Establish a Symptom
TCP Connection
A TCP connection cannot be established and the status information given by the
display dlsw remote command is DISCONNECT.
Analysis
TCP connection establishment is the first step in successful DLSw connection.
Failure in establishing a TCP connection is usually caused by problems between the
two routers, normally incorrect IP routing configuration.
Solution
Check whether the IP address of the remote peer is reachable by using the ping
command carrying the source address. Alternatively, use the display ip
routing-table command to check whether there is a route to the network