Cisco Switching/Routing :: Interface Numbers On A 3750 Switch?
Jul 31, 2012
Is there a way to change interface numbers on a 3750 stack but, still retain the config of the physical port?
For instance:
I would like to take the top switch, which has the ports numbered g2/0/1 - 52 and change them to be g1/0/1 - 52. And the bottom switch, which has ports numbered g1/0/1 - 52 and change them to be g2/0/1 - 52. Basically, just swap the interface numbers but, not effect any interface configurations.
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Mar 3, 2011
I've got a 3750 stack with a 3750-48p being switch 1 and a 3750-12s being switch 2 and switch 2 is the master. I would like to change the stack member numbers. I would like the 3750-12s to be switch 1 and the 3750-48p to be switch 2. I undertand I will have to reboot the stack for the change to take affect but here are my questions: How would this change affect the stack running-config ? will the switchport config follow the change ?
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Feb 5, 2012
I've got a 3750 stack with a 3750-48p being switch 1 and a 3750-12s being switch 2 and switch 2 is the master. I would like to change the stack member numbers. I would like the 3750-12s to be switch 1 and the 3750-48p to be switch 2. I undertand I will have to reboot the stack for the change to take affect but here are my questions:
- How would this change affect the stack running-config ?
- will the switchport config follow the change ?
switch 1 provision ws-c3750-48p
switch 2 provision ws-c3750g-12s
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Jun 13, 2011
it's possible to retrieve Tengig interface serial numbers via CLI? We have a couple of them in 3750 switches, and we need them for our inventory.
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Jan 27, 2012
I have a 3750 as core switch, adding 2 stacks of 2960S to connect. I want to establish etherchannel between the 3750 and each additonal 2960S stack, do the channel group numbers between the 3750 and the new 2960s have to match? 3750 has two channel-groups(1 and 2) already configured. Need to know, I would create 2 additional channel groups (number 3,4) for each of the etherchannels between the 3 2960S Stacks and 3750? OR channel-group # is local to the device.
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Mar 13, 2013
One of my Catalyst 3750 switch have many out drops, I execute "sh mls qos int g2/0/3 statist" command, there are many output drops in queue3 threshold3. [code]
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Feb 21, 2012
On a router I can use IP Accounting or Netflow to see what kind of traffic is moving over an interface. Are there any tools on a 3750 switch with a routed interface which would tell you who is hogging the bandwidth on that interface?
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Nov 2, 2011
i have an issue to connect a trunk between cisco switch and extreme switch i have many vlans that i want to cross via a link between cisco 3750 switch and a Extreme Alpine 3800 switch
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Nov 18, 2012
I have two 3750-X configured to be a stack and I am planning to re-rack these somewhere else. What I would like to know is what are the effects of having the master switch itself lose power? Does it immediately just make the member take over master (there should be no election since there are only 2 switches??) and there would be no loss of connectivity?
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Jan 16, 2012
I'm troubleshooting a 3750 switch stack problem where computers are showing input and CRC errors. I'd like to be able to execute a "show interface" command that will show me only the line showing the switch port and the line showing the input errors, but so far I can't figure out a way of combining those two parameters.
If I do "show interface | include Ethernet[0-9]�" I get all the lines showing the port numbers:
GigabitEthernet1/0/1 is up, line protocol is up (connected)
GigabitEthernet1/0/2 is up, line protocol is up (connected)
GigabitEthernet1/0/3 is up, line protocol is up (connected)
[Code].....
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Dec 12, 2012
Cannot set route map on interface vlan. which in non default vrf on Cisco 3750.IOS c3750-ipservicesk9-mz.122-55.SE.bin sdm prefer route in enable ip vrf users rd 200:0 route-target export 200:0 route-target import 200:0 interface Vlan201 description Users 1 ip vrf forwarding users ip address 10.31.76.1 255.255.252.0 ip helper-address 10.31.4.57 route-map fromuser permit 10 match ip address fromuser set ip next-hop 10.31.128.155 When I enter "ip policy route-map fromuser" to interface Vlan 201 I heve the message:
% Remove VRF configuration from interface Vlan201 first
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May 15, 2011
I am seeing Interface output drops that appera to be incorrect. When I do "Show Interface gi1/0/20", I will get interface output drops of "4294961382". But, when I do the same command again it shows "0" drops. Is this a reporting error? I am ruinning c3750-ipservicesk9-mz.122-58.SE.bin on a 3750 stack with 2 switches in the stack. [code]
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Jan 12, 2012
how to configure this. I did it in the past but kind of forgot how I did it.I have a stacked 3750 (two physical switches) connecting to a 2960.
I am creating trunk ports with limited access to VLAN 300, 600, and 700.
There is two interfaces connected from the 3750's(one on each physical stack member) to the 2960.I have the physical interfaces configured exactly the same.
3750 Config:
interface Port-channel2
!
interface FastEthernet1/0/46
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1, 300,600,700
switchport mode trunk
speed 100
[code]....
Should I keep the configuration on the physical ports and not configure the Port-Channel Interfaces? Do I need to configure port-channel load balancing? Is the channel-group mode sufficient? Goal is to basically create 2 links to the 2960 to double the bandwidth and provide redundancy.
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Dec 17, 2011
I have been looking into this for a while and I can't seem to figure out why my 2nd vlan is not able to connect properly to the net.
My switch has 12 ports where my devices connects directly, they are all on Vlan 1 and they all work perfectly. on Port 12 I have a dlink router that is connected to a cable modem. the dlink router has an Ip address of 192.168.0.20
I created a second vlan (vlan2) and enabled dhcp relay on it. then I assigned port 9 on the switch to (vlan2)my laptop which is connected to port 9 seems to get an ip address fine and able to ping only some devices on my network (vlan1) and is not able to go out to the internet. I think it has to do with the routes. [code]
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Jul 27, 2012
I have the task of replicating the router config on a 3825 router on a 3750 switch. Reason is we are taking out the router and replacing it with the switch to make use of the router for other functions.
Below is main part of the router config:
!
ip source-route
ip cef
!
!
multilink bundle-name authenticated
!
license udi pid CISCO3825 sn FCZxxxxxxx
!
vlan internal allocation policy ascending
[code].....
The 3750 switch I have runs C3750E-UNIVERSALK9-M, Version 12.2(55)SE3 on a LAN BASE license.
The first thing I have done is to order for a license upgrade to IP BASE which would give the support for OSPF routing.I do not see much of an issue with the Interface configs, however, I am not too sure about replicating the routing config on the switch.
My question is can I run the commands as shown for the OSPF routing on the switch? If not, can I get suggestions on how best to set this up on the switch?
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Apr 16, 2012
I have been looking into this for a while and I can't seem to figure out why my 2nd vlan is not able to connect properly to the net. My switch has 12 ports where my devices connects directly, they are all on Vlan 1 and they all work perfectly. on Port 12 I have a dlink router that is connected to a cable modem. the dlink router has an Ip address of 192.168.0.20,I created a second vlan (vlan2) and enabled dhcp relay on it. then I assigned port 9 on the switch to (vlan2),my laptop which is connected to port 9 seems to get an ip address fine and able to ping only some devices on my network (vlan1) and is not able to,go out to the internet.
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Mar 11, 2012
I'm running into what seems a basic ip routing config problem with a Catalyst 3750 (IP Base) switch. I have several VLANS configured on the switch with IP routing enabled, and the switch is connected to the inside interace of a new ASA 5520 as follows:
ASA5520 IP (Default gateway): 192.168.1.1Switchport Gi1/0/1 is configured as a routed port, IP address 192.168.1.3 255.255.255.0Example VLAN is VLAN 100, IP address 192.168.100.1 255.255.252.0 From the switch CLI, I can ping all VLAN addresses, as well as the ASA5520, and the client laptop I'm testing with from VLAN 100.
From the client laptop on VLAN 100, I can ping all switch interface and VLAN addresses (inter-VLAN routing is working), including 192.168.1.3, but I CANNOT ping the default gateway at 192.168.1.1.
Here is the relevant configuration information on the 3750:
!
no aaa new-model
switch 1 provision ws-c3750x-24
system mtu routing 1500
[Code]....
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Nov 7, 2011
configure qos in Cisco 3750 switch.I have configured below template and applied on the vlan interface.But i am getting the hit on the access list but I am not able to get hit on the class map.
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Jul 19, 2012
I had a bad expirience with Switch 3750-X. Because of an auditing security processess, my customer ran a software called "Nessus" to do a scanning of vulnerability on the network. When this software is point to switch, the process of the switch will next to 100% and reset. The software only do a listening on the ports to see what ports are opened and the switch should not reset because this. Bellow is the log os switch on the moment of test; we note that the processess 'HTTP' rise moments before the switch reset. I disable the HTTP service on switch but the problem persist. The test was made only one machine connected to switch.
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Aug 12, 2012
We have three Cisco 3750 - 48port POE -LAN switches and i am trying to see if there are any issues when we stack POE and Non-POE type of switches.Aslo looking for information on the advanatage and disadvantage the stacking can provide on a Cisco 3750 48port.
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Dec 12, 2010
The question is: Will a 3750 switch route Jumbo frame sizes (e.g. 9000 MTU)?
We know that we can change the System MTU to 9000, and someone on a previous thread said that we can change the Routing MTU to 9000 as well, although I couldn't figure out how to do that. However, regardless of how we configure the System MTU and Routing MTU, I don't think we're able to adjust the MTU on L3 VLAN interfaces, so if we want to actually "route" between VLANs on the switch, we're limited to 1500 MTU.
Our situation is that we have a customer connecting to our 3750 switch, and this customer wants to use Jumbo frames. The customer connects to our 3750 switch via their own VLAN, with their own L3 VLAN interface configured on the switch. The customer will point their traffic towards the L3 VLAN interface, then we want to route them onto another VLAN, via a different L3 VLAN interface, before forwarding their traffic. Because of the limitations noted above, specificially regarding the routing between these VLANs via L3 interfaces, I do not think we'll be able to support 9000 MTU frames on this 3750 switch. I think the L3 VLAN interfaces will limit us to 1500 MTU, regardless of what we configured via the global System MTU and Routing MTU settings.
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Jun 8, 2007
How do you properly remove the QOS queues and configs from the switch.A was using auto qos which created a whole mess of qos configs on my running-config. I did "no mls qos" in conf term but that did not remove the queues.
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Jun 21, 2012
i want to remove an access layer 3750 48 POE master switch and replace with a new 3750 switch in the stack. i want to copy the same configuration to new switch since the old switch is having POE issue and I got replacement of the malfunctioned switch. we have VTP domain is configured in the network...
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Sep 11, 2012
Cisco 3750, I'm trying to reset the password but cannot communicate with my switch
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Dec 9, 2012
is it generally possible to connect another switch, such as a 3750 to a port of a fabric extenders (C2232PP-10GE)?
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Apr 16, 2013
I have Layer_3 " 3750-x " , so I can't do any routing on the switch , so if I need to Upgrade the IOS what is the proffered image that support hte routing , and Is it free or should I pay?
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Oct 19, 2012
In Cisco 3750 facing high CPU utilization for specific period. During this period traffic response times across the switch degrades. Steps to identify interface potentially generating traffic. I have attached 'sh proc cpu history' , ' sh ip traffic', 'sh proc cpu sorted' during troubled period .
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Mar 27, 2013
I have a 2 member 3750-x switch stack that was upgraded to 15.2 today via CNA. All the files were transfered and expanded correctly and it got to the step where the switches needed to be reloaded but on reload they froze.
I connected a console cable and power cycled the stack. I see the flash initialize and then the IOS image start to load. Lots of @ symbols and then nothing. It just sits there. The system light on the switches, while flashing green during the load, is now off. No light at all. But fans are running and the process will repeat itself if power cycled.
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Nov 17, 2012
i have standalone 3750 switch. RPS light is green and system light is off.
3750TS#sh env all
FAN is OK
TEMPERATURE is OK
[Code].....
i have another switch with same model and ios its RPS light is off and system light is green
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Apr 30, 2013
We currently have a stack of 5 x 3750 switches and i want to remove switch number 3 (it has the least number of things plugged in). What will happen to switch 4 and 5 will they be renumbered 3 and 4, and will the config automatically update this if it does?
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Nov 17, 2012
I configured 3750 A switch with vlan 20 and its IP address 192.168.20.41Its default gateway was 192.168.20.3Then i configured 3750 B switch with same default gateway and vlan 20 IP 192.168.20.43My question is now when we stack it becomes single switch and now vlan 20 ip address is 192.168.20.43 thats only IP i can see.So how does stack switch choose vlan 20 IP?Does it choose highest IP address between two switches if they have same vlan 20 as in my case?Also when i go to switch 3750 b by session command and do sh ip route it does not show ip default gateway .Also it shows vlan 20 as admin down .
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Aug 11, 2011
I have a doubt. In my environment I have two Switch 3750-X in stack.
My question is: How to shutdown remotely only a switch in stack?
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Nov 24, 2012
I want to configure " Username & Password" on Cisco 3750 switch. I need to configure as "username xxxxxx privilege 15 password 5 xxxxxxx "
Is it possible to create password with level 5 ? I want to know about level 5 "password" & level 7 "password" ?
when i tried I am not able to configure with " password 5"
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