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Questions tagged [cisco-3750]

The Cisco Catalyst 3750 is a line of 1-RU switches by Cisco Systems.

6
votes
1answer
1k views

Cisco 3750X Power Cable

I received a Cisco 3750X the other day. I went to go plug it in for testing and found that the standard three prong female power connector is no longer compatible with the power supply. Cisco has ...
0
votes
1answer
73 views

Finding the IP address of a Cisco 3750G

Hello i have a Cisco 3750G switch and i need to find the IP address and I dont have a serial cable, so I need the IP address to login into the web-interface. Does it need to be connected to a network? ...
1
vote
1answer
42 views

Cisco 3750 - configure to mimic multi location scenario

Good morning. For starters, I am less than a noob with cisco products. I can access, so basic trunking for our nec phone systems, etc. I have a 3750 that I'd like to configure to mimic a multi ...
0
votes
1answer
625 views

Mixed stack IOS upgrade - Cisco 3750x,3750G

I have a mixed switch stack : - Switch Ports Model SW Version SW Image ------ ----- ----- ---------- ---------- * 1 ...
3
votes
4answers
506 views

Syslog severity level to 5 + ACL BLOCKED log

I am on a L3 switch C3750 IOS 12.2 and I want to log in the buffer (or just to the syslog server) all severity 5 messages and just the ACL Blocked level 6 messages. Is there a way to do this ? I've ...
1
vote
1answer
972 views

How to VLAN tag all traffic from one port before it goes out another

I am trying to figure out the configuration required to vlan tag with vlan 201 all traffic coming from one port and send it out another to the ONT for CenturyLink. I have a Cisco 3750e that I am using,...
1
vote
1answer
5k views

vlan line protocol up/down

I have created L2 vlan & SVI's on core switch. but it shows status UP, Line protocol DOWN. Vlan11 x.x.x.x YES manual up down Vlan21 x.x.x.x ...
3
votes
1answer
158 views

Authentication error

I have set the username **** privilege 5 secret **** & applied aaa via console. now unable to access switch through console. After entering enable showing authentication error. can someone help ...
0
votes
2answers
95 views

3750 failed post. Internal fixed?

I have a 3750 manufactured in Feb of 2009, model number ws-3750-48ps-s V07. I'm consoled into it and when I power the switch, it boots (fans RPM) but no console display at all. The POE, stack, and ...
1
vote
3answers
5k views

Cisco 3750 switch stack with different IOS images

There is a situation here, I am trying to add a new switch to an exisiting stack and i found out that the switch image in my current stack and the new switch is different. Can i still go ahead and add ...
2
votes
1answer
3k views

Disable “ip redirect” Cisco 3750

I am experiencing high CPU utilization on a Cisco 3750. After consulting with Cisco TAC, it seemed we get a lot of icmp request that the switch redirects so asked what if I disabled the "ip redirect" ...
1
vote
1answer
228 views

AAA Authorization

I have a 3750x with TACACS AAA configured. If I login using TACACS, CLI commands run fine, no wait between commands. However, if I disconnect from network, taking away the ability to hit the tacacs ...
1
vote
1answer
100 views

Segregated OSPF Networks, cross same physical path, how to segregate back out at other end?

I'm sorry for being basic in writing this question. I think the details have been covered though. What's happening here is, two separate networks are being brought into an isolated area over a ...
5
votes
2answers
3k views

Using channel-group mode on in my full Cisco enviroment

this is my first question over here. I have a question about using channel-group mode on or channel-group mode active. I have a core 3750x with 2 stacked SFPs nodes. Each pair of ports of a node ...
1
vote
1answer
412 views

Does “lacp port-priority” not work on Cisco Catalyst 3750 series?

I have a Cisco WS-C3750G-12S switch physically connected with ports Gi1/0/1 and Gi1/0/11 to Cisco WS-C3750G-24TS ports Gi1/0/1 and Gi1/0/27 respectively. Ports have different LACP port-priority: WS-...
2
votes
1answer
255 views

Etherchannel trying to forward traffic through disabled ports

I am troubleshooting intermittent connectivity issues towards a WLC connected to a stack made of three 3750G switches. Part-number and software version of the switches are: Switch Ports Model ...
4
votes
1answer
2k views

Cisco 3750-X Stack Bandwidth

I am currently managing a large datacenter spine-and-leaf topology. On our leafs, we use stacked 3750-X switches. I want to know how much bandwidth is currently going across the stack links (...
3
votes
1answer
199 views

Cisco Fiber switch perform at 100/1000

One of my switches is being replaced. It is a 24 port 100 base MTRJ Cisco switch. It is being replaced with a WS-C3750X-24S-E. Will this switch support 100/1000 or 1000 base only? I have some ...
8
votes
2answers
3k views

Impact of removing VTP from a production network

We are planning to remove VTP from a production network that has RPVST running. This is at the core (a pair of Cisco 3750s) and we are trying to weigh the impact it has on the production network. In ...
2
votes
5answers
1k views

IPv6 address assigned to vlan interface of 3750 switch changes

When setting up my 3750 stacks, I enable IPv6 on the Vlan1 interface so that I can manage the stack over IPv6. The stacks are not doing any layer 3 routing. However, it seems that the IPv6 address ...
6
votes
2answers
3k views

SNMPv3 Setup - Cisco 3750

I am not a network guru by any means but need to setup our router/switch to use SNMPv3. I am installing What's Up Gold on our system and configured the settings (changed for this post) as follows: ...
3
votes
2answers
6k views

portchannel cant bundle flow control mismatch

Having a strange issue here.. I replaced a stack member (2 members in a stack of Cisco 3750x). Both switches have a 10Gb card and I had a perfectly working LAG/etherchannel between to 10Gb ports. ...
5
votes
1answer
3k views

Setting up a switch to pass data from a SPAN port

Situation: We have a 3750 with a monitoring session setup on it, grabs a few VLAN's running over the switch and has a destination port on that device (normal SPAN not RSPAN). Historically speaking - ...
5
votes
3answers
4k views

Can you stack Cisco 3750 using ethernet cables?

I am just wondering if it's possible to stack Cisco 3750 switches using their ethernet interfaces? I don't have the proprietary stacking cables.
6
votes
4answers
346 views

Cisco SFP module: Determing Priority?

I have two 3750 Cisco switches that have two fiber cables/sfp modules hooked up on each. The second fiber is just for redundancy. I have installed two new 3750X switches on the rack for the upgrade, ...
24
votes
10answers
226k views

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

On a Cisco 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?