Page 319

Troubleshooting Token Ring Problems

283

Now, you should be able to distinguish some differences and pinpoint the

problem. There are two fields within this output that differ from the output
from Router A. The first hint is to look at the interface metrics. The second
hint is to look at the ring speed.

Now, list the observations:

The Token Ring interfaces on Routers A and B are in an up/down state.

Router A ring speed is set to 4Mbps.

Router B ring speed is set to 16Mbps.

The problem statement is "The ring speeds for Routers A and B are different."

Propose Solutions

The solution for this case is straightforward. Change the ring speed on
Router A to match the ring speed on Router B. The configuration follows:

Router_A(config)#interface to0

Router_A(config-if)#ring-speed 16

Router_A(config-if)#^Z

Router_A#

Now, verify the interface status. The interface should be in an up and up state:

Router_A#show interface to0

TokenRing0 is up, line protocol is up

Hardware is TMS380, address is 0007.787c.e14b (bia

0007.787c.e14b)

Internet address is 172.16.30.1, subnet mask is

255.255.255.0

MTU 4464 bytes, BW 16000 Kbit, DLY 630 usec, rely 255/

255, load 1/255

Encapsulation SNAP, loopback not set, keepalive set (10

sec)

ARP type: SNAP, ARP Timeout 04:00:00

Ring speed: 16 Mbps

Single ring node, Source Route Transparent Bridge

capable

Ethernet Transit OUI: 0x000000

Last input never, output never, output hang never

www.sybex.com