Chapter 7: Spanning Tree Protocol (STP) 129
Section 7-4
Bridge ID Priority 49152
Address 0005.32f5.45ef
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Port Designated
Name Port ID Prio Cost Sts Cost Bridge ID Port ID
———- ———- —— —— —- —— ——————— ———-
Fa0/1 128.13 128 3100 BLK 3006 0005.32f5.45ef 128.13
Fa0/2 128.14 128 3019 FWD 3006 0005.32f5.45ef 128.14
...(output removed)...
Gi0/1 128. 67 128 3004 FWD 2 00d0.ff8a.2a15 129.7
Gi0/2 128.75 128 4 FWD 3006 0005.32f5.45ef 128.75
Here, STP port 67 corresponds to the physical interface Gigabit0/1. The output
also shows a bonus piece of information: the MAC address of the designated
bridge on the root port.
d. Identify the designated bridge on the root port:
(exec) show cdp neighbor type mod/num detail
The neighboring switch can be found as a Cisco Discovery Protocol (CDP)
neighbor if CDP is in use. Look for the neighbor’s IP address in the output. An
example follows:
switch# show cdp neighbor gigabitEthernet 0/1 detail
————————————
Device ID: SCA03320048(Switch-B)
Entry address(es):
IP address: 192.168.254.17
Platform: WS-C6509, Capabilities: Trans-Bridge Switch
Interface: GigabitEthernet0/1, Port ID (outgoing port): 5/7
Holdtime : 120 sec
After the IP address has been found, you can open a Telnet session to the neigh-
boring switch.
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