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dellpe

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Cisco Network Technology

Cisco Network Technology

I am Dong, a network engineer from Cisco wholesaler 3Anetwork.com.We enjoy cisco technology here.
dellpe dellpe
Articles : 157
Since : 20/12/2013
Category : Tech & Science

Articles to discover

Cisco Catalyst switches port-channel interface

Question: To connect two WS-C2960S-48TD-L Catalyst switch stacks, I use EtherChannel, i.e. I aggregate several ports on each switch to get more bandwidth and higher availability than with just a single port. However, the link doesn't work yet. What could cause the problem? Answer: Improperly configured EtherChannel (port-channel) interfaces would b

How to find the port a device is connected to, based on IP, on a Cisco Catalyst switch

Question: On a Cisco WS-C3750X-24S-S Catalyst switch, I need to find what port an end device is connected to. I have the IP address/host name. How do I quickly find the port? Answer: The answer depends on whether the switch is a Layer 2 or a Layer 3 switch. That is to say, is the switch only switching and relaying traffic on to a different device f

How can I make a PVST+ switch root towards MST network?

Question: In a network where the majority of the Cisco WS-C3750X-48P-S switches are running MST but a select few are still running PVST+, how can the PVST+ switch be configured to be the root of the spanning tree? Topology below: +--------+ +---------+ | +-------------+ | | SW1 | | SW2 | +---+----+ +--+--+---+ | | | | MST | | | | | | | | | +-------

Configuration Change Notification and Logging

Change notification is a nice feature on Cisco IOS devices that lets you keep track of the changes that have been made to your configuration. It can even track the user who made these changes and it can send this information to a syslog server. This is one of those features that is very useful when something suddenly doesn’t work anymore and ever

Cisco Switch Password Recovery

This tutorial documents the procedure for performing a password recovery on a Cisco WS-C2960S-24TD-L switch (and probably other models, as well). 1. Unplug the power cable. 2. Hold down the mode button while replugging the power cable. 3. Type flash_init over the console. 4. Type load_helper 5. Type Dir flash : //make sure to type the semi-colons 6

Cisco active/standby FWSM pair went active/active after switch upgrade

Question: PROBLEM: Both FWSM in our core switches went active/active and protected subnets have partial accessibility. SETUP: We have 2 x Cisco Catalyst 6509 switches running IOS version 12.2(18). Each switch has a FWSM internal firewall module. Both are multi-context split into 2 groups. One FWSM should be active for both groups while the other FW

How can I make a PVST+ switch root towards MST network?

Question: In a network where the majority of the Cisco WS-C3750X-48P-S switches are running MST but a select few are still running PVST+, how can the PVST+ switch be configured to be the root of the spanning tree? Topology below: +--------+ +---------+ | +-------------+ | | SW1 | | SW2 | +---+----+ +--+--+---+ | | | | MST | | | | | | | | | +-------

What is the difference between router and L3 switching

Question: What is the difference between router and L3 switching apart from WAN interfaces? Answer: Routers were devices that connected the LAN to the WAN and switches were just LAN devices and you may add a layer 3 switch,for example WS-C3750X-48P-S to the lan if you had some vlans and didn't want to use a router. However, as technology changes, t

Portfast to non managable switch

Question: Recently i have found that in one of the Cisco WS-C2960S-48FPS-L switches in our environment, portfast enabled to a interface whichis connected to a non-managable switch. But 3 servers are conencted to that non-managable switch. Since this switch is connected to only servers, there wont be any problem, right?? Answer: I see two aspects to

How can I make a PVST+ switch root towards MST network?

Question: In a network where the majority of the Cisco WS-C3750X-48P-S switches are running MST but a select few are still running PVST+, how can the PVST+ switch be configured to be the root of the spanning tree? Topology below: +--------+ +---------+ | +-------------+ | | SW1 | | SW2 | +---+----+ +--+--+---+ | | | | MST | | | | | | | | | +-------