Cisco Catalyst 4948 User Manual

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.

Cisco Catalyst 4948 Specifications

General

Switching Capacity	136 Gbps
Forwarding Rate	102 Mpps
Rack Units	1U
MAC Address Table Size	32, 000 entries
Authentication Method	RADIUS, TACACS+
RAM	256 MB
Flash Memory	64 MB
Power Device	Internal power supply
Voltage Required	100-240 VAC
Weight	16.5 lbs
Operating Humidity	10% to 85% non-condensing
Ports	48 x 10/100/1000
Power Supply	Internal
Layer Support	Layer 3
Jumbo Frame Support	Yes (up to 9216 bytes)
Routing Protocol	RIP, OSPF, EIGRP, BGP
Remote Management Protocol	SNMP, Telnet, SSH
Features	VLAN support, QoS
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.1Q, IEEE 802.1p
Operating Temperature	32 °F to 104 °F (0 °C to 40 °C)