Cisco Systems RJ-45-to-AUX manual Show flash, Show interface, Show log, Show mac, Show port

show flash

Cisco switches operate with software that is very similar to the Cisco IOS on routers. This software is stored and may be upgraded in flash stored on the Supervisor module. The show flash command reports the space required for the installed software and the version of the code, including the file names, software version numbers, and file sizes. Unfortunately, there is no comparable command on the 1900EN series switches.

show interface

You can use the show interface command to get the IP configuration, interface flags, interface state, VLAN information from the Supervisor Console 0 (SCO) interface, and broadcast address. This command can be used on both the Set/Clear and CLI−based IOS.

show log

Using the show log command, you can look at significant events, including reboots of all the modules, traps, logged events, boot history, nonvolatile RAM (NVRAM) logs, module logs, and power supply failures. This command cannot be used on the 1900EN series switches.

show mac

The output from the show mac command is quite long. This command displays numerous counters that are maintained during normal operation. These counters include information on the traffic for each port, number of incoming frames, number of frame discards, total number of frames sent, and maximum transmission unit (MTU) violations.

Note On the Cisco CLI−based IOS, use the show usage utilization command.

show port

Using the show port command, you can receive specific information about selected ports or all the ports on a specified module. This data includes the VLANs the port belongs to, port configuration information, port status, port speed, port duplex, port media type, security information, source MAC address of the last packet received, broadcast threshold, number of collisions, link error rate (LER), link error monitor (LEM), last report cleared time, and whether port trap is enabled.

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show spantree

The use of spanning trees is a necessity in today’s networks in order to provide for redundant links and at the same time avoid a data looping problem. The show spantree command can be used to display the STP configuration crucial to the successful running of a switched network. The output from this command can tell you whether STP is enabled or disabled, the bridge or port priorities, the root bridge priorities, the path cost to the root, BPDU information, the bridge MAC address, timer information, the port states, and information on the fast−start configuration of each port. This command is similar on the Set/Clear IOS and the CLI−based IOS.

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Verifying the VLAN Priority Settings	331

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