Cisco WAN :: QoS Configuration For 3750 Switch WAN Port?
Jul 27, 2011
We are using 3750 switches as WAN router facing the WAN cloud. To configure QoS for its WAN port, should I use 'auto qos voip trust" or treat it like a router port and configure class-maps, policy-maps, and attact service-policy input or output?
Because switches have different queuing and dropping methods than routers, auto qos can generate QoS configs that are considered most appropriate for 3750 switches. However the switch functions as WAN router. Maybe it should be configured using router type of QoS with policy-maps and service-policy?
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May 29, 2013
Since Avaya phones do not run CDP, how does the phone know which DHCP pool to pull from to get its IP address if the PC is connected to the phone.
Let's say I have a interface config like this
interface gigabitethernet1/0/1
cisco3750(config-if)#switchport mode trunk
cisco3750(config-if)#switchport access vlan 126
[code]....
And two DHCP scopes configured on the switch. What keeps the phone from pulling from the wrong scope?
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Jan 16, 2013
I am writting in response to MAB issue which I noticed a few days ago and I am still not able to undestand what exactly happend. First of all I would like to say that I configured MAB authentication and according to the MAC the ISE configure a VLAN. All worked well: the test computer can change VLAN based on its MAC. The problem appear when I cut the connection to ISE server. Accourding to configuration the switch authorize the new device to VLAN 11 (critical VLAN) That is fine ! When the ISE server is up again I had a configuration which should reauthorize all ports assign in critical VLAN. But why that is not happend ??? It looks as the switch didn't notice that the RADIUS (ISE) was up and working again. [code]
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May 20, 2013
im trying to move the config from an 3750 to 3750 PoE but without using the PoE options.I have allready download the config with tftp and upload it to the 3750 PoE. Now the new config is stored on the PoE switch but some of the old setting are still there. Not sure why, i think the config only overwrite the settings which are in the conf file and the setting which are not in the conf file but enabled on it will stay on the switch.After the upload of the config file I deleted all the config I do not need by hand.They are some settings i can't delete and I don't know why, this are the sittings:
1. each fastethernet port has this option: "no cdp enabled" this entry was no availble on the old switch, is the any possiblity to remove this entry?
2. the same for "no mls qos rewrite ip dscp"
3 and for this one "vlan internal allocation policy ascending"
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May 6, 2013
The access swtich is a Cisco 3750 and the Core switch is a Nexus 5000 series. I am configuring the switchport were the AP (3502) and WLC (5508) is connected below:
For AP: interface GigabitEthernetX/XX
switchport access vlan 244
switchport mode access
[Code]....
The WLC is connected to the Nexus switch and it is not accepting the 'mls qos trust cos' command.
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Jul 4, 2012
I have a 3750 stack of 4 switches that was installed about 2 years ago. Recently I was doing some work on the switch and realized that I am unable to save the config. I amobviously concerned that if the power fails or the switch reboots I will be reconfiguring it and that is not something I am interested in doing!
Here is the error that I am receiving:
switch#copy run startup-config
Destination filename [startup-config]?
Building configuration.
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Sep 28, 2011
I am trying to configure a trunk between the above two devices. I like to have vlan11 on ASA. Then I like to connect a host to my switch, and have it communicate with other devices in VLAN 11 or other vlans that reside on the ASA. Below is the config that I currently have.
ASA:
ciscoasa# show run interface Ethernet0/1
!
interface Ethernet0/1
[Code].....
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Apr 17, 2012
I am uploading new configurations to my Cisco 3750 stacked switch and noticed that after the load I cannot log back into the switch because my password somehow was changed. After performing password recovery and getting back into the swtch, I noticed the configuration register was 0xF. I have never seen this before. The config-register command does not seem to be supported to change it back to factory default. The switch is on a ship which has several power hits when they switch power from shore to ship power.Can this cause the configuration register to change? What is the best way to change the configuration register?
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May 23, 2012
I'm trying to configure a mirror port on a 3750. This configuration needs to replicate data from local ports, but I need that also act as a regular access port.
With the initial configuration, SPAN port, there is no problem, all the data of the configurated ports is replicating in the configurated port. On the port configurated as mirror there is a PC connected for audio recording. When the port is not operating as SPAN there is communications without problem over the LAN. But when I configure the port as SPAN, communication is interrupted.
Here is the actual configuration:
SWITCH1-PISO7#sh monitor session 1
Session 1
---------
Type : Local Session
[Code]......
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Nov 7, 2012
I have 2 3750x switches connected via a pair of stackwise cables, but I keep seeing error messages about the stack&switch ports going up and down,Performance wise, it seems to work, but I'd like to eliminate this message... Sometimes it will go hours without bouncing, sometimes it does it a few times a minute....
*Mar 4 12:56:57.903: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
*Mar 4 13:16:48.070: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state UP
*Mar 4 13:16:49.093: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state DOWN
*Mar 4 13:38:55.802: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state UP
*Mar 4 13:38:56.809: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 1 has changed to state DOWN
[code]...
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Dec 20, 2012
I have stack of 2 switches 3750?I config etherchannel between them.
here is result
2 Po2(SD) LACP Fa1/0/15(I) Fa2/0/15(I)
Both ports are up up but standalone Int port channel 2 is down down.Need to know if this is default behaviour when we config etherchannel between stack switches?
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Feb 27, 2013
I am building a new network and intended on using the min-link feature on my port-channels between a 3750-X series switch and Nexus 4k.
However reading further into this it seems this feature is only supported on higher end models. I cannot find any reference to the min-links feature in the 3750-X configuration guide. Is this an available feature?
The 3750-X model is WS-C3750X-24T-L running IOS 12.2(55)SE3 IP Services
My thoughts is that the is only an LACP supported feature so I may not see the command until I have entered an LACP specific command on the port-channel but unfortunately I do not have a 3750X to verify this on at present.
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Mar 6, 2013
I have a 2911 router connected to a 3750 switch. I have configured vlan interfaces on the 2911 router:I am using the vlan 89 (89.2) as the management ip address for me to remotely get to the switch. Is this a proper configuration or could this cause issues in the future.
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Dec 13, 2011
boot system switch all flash:c3750-ipservicesk9-mz.122-55.SE1/c3750-ipservicesk9-mz.122-55.SE1.bin;flash:c3750-ipservices-mz.122-25.SEE2/c3750-ipservices-mz.122-25.SEE2.bin We have two stack of 3750 switches. When I enter above command getting below mentioned error, two images are showing switch 1, but one image only showing in switch 2, i.e 1st image in show boot command.
%Command to set boot system switch all flash:c3750-ipservicesk9-mz.122-55.SE1/c3750-ipservicesk9-mz.122-55.SE1.bin;flash:c3750-ipservices-mz.122-25.SEE2/c3750-ipservices-mz.122-25.SEE2.bin on switch=2 failed
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Feb 22, 2013
We have configured Cisco 3750X POE series switchs with Stack.WS-C3750X-48P each with Redundant 1100W & 715 W PSU's. They are configured with Stack-Power in Sharing mode and the switches are Smart Stacked as well.IP Phone and Access points are connected its working in last two years,
Now we are facing some issue on Cisco IP Phone and Access point, When i have problem if unplug (disconnect & Reconnect) the IP Phone from Switch port,Power is not comming on switch port.Plug it into another switchport of the same Switch it may not power in any port.I tried shut & no shut and reconfigured on switch port , I have verified multiple switch ports same issue on the switch I have changed cable.
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Apr 9, 2012
I have a customer that would like a 40Gb port-channel between two 3750-x switch stacks. When I try to activate four 10Gb ports in the channel, they go into error-disable. However, I am able to create a 20Gb port-channel without issue. I have had my configurations verified to Cisco best practice.
Is there a limitation on the amount of throughput that the 3750-x can handle? According to the data sheet the 3750X-48T can handle 101.2mpps, based on two 10Gb uplinks so if my math is correct then a stack of two 3750X-48T should be able to handle 202.4mpps.
[URL]
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Apr 15, 2012
There 's a Cisco IP phone that sits between a PC and the switch port. On the switch port, no MAC address is learned. However, the switch is able to detect the IP phone and deliver power to it: [code] Switch is Catalyst 3750 with IOS version 12.2(58)SE1.
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Feb 7, 2011
I have a stack with a lot of stack-port changes, but on all the ports, how can I determine the faulty switch in the stack, cables are already verified. We did also a restart of the whole stack power off/on
running version
WS-C3750-48P 12.2(55)SE C3750-IPBASEK9-M
This is the output after 6weeks
Switch#/ Stack Neighbor Cable Link Link Sync # In Port# Port Length OK Active OK Changes Loopback Status To LinkOK -------- ------ -------- -------- ---- ------ ---- --------- -------- 1/1 OK 4 1
[Code].....
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Nov 6, 2012
I have a 3750 catlyst switch in my network and it is like a distubation switch,And for the nating and dhcp nomadix is using as gateway in the same network. for one of my local PC i need to config the port forwarding in 3750 switch. How to config the port forwarding on 3750 switch,
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Nov 8, 2011
I'm trying to setup a port on a catalyst 3750 so it will pass traffic for 2 vlans. It connects to a (watchguard) firewall which I've configured with a primary IP (for vlan 27) and a secondary IP (for vlan 29).
However I can't seem to find the correct commands to enter on the cisco switch port (I've tried a variety).
FYI the current configuration is...
interface FastEthernet1/0/38
description ## Connection to WG vlan27 and vlan 29 ##
switchport trunk encapsulation dot1q
[Code].....
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Oct 7, 2012
We have QoS configured throughout the company, but the standard config we have applied across the 3750 switches only includes the below: We have IP phones (not cisco) attached that are marking with EF, and the PC is an untrusted end device (so needs to be by default marked as zero).Is the above enough to trust VOIP DSCP EF without resetting it to DSCP 0, or do I also need to add a trust line (i.e.: mls qos trust dscp)?
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Apr 23, 2012
I would like to know how many port channel can i configured in the switch 3750 X ? and if there is a limitation by IOS ?
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Aug 8, 2011
how to 24 port networking switch configuration
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Oct 27, 2011
If i fully populate all switch port (Cisco 3750 series) with 100 filter list on each port is it recommendable.
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Apr 3, 2012
I have one 12-port 3750 switch having one gig connectivity with ASR-9010 router having IOS-XR. I am not able to ping this link with 9000 mtu size. I have enable system mtu jumbo on switch to 9000 and on ASR router interface mtu is set to 9114. At switch side switch interface is configured as a trunk port and one vlan has been passed on that interface. I am not able to ping the ip 172.16.10.2 with 9000 mtu size.
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May 30, 2013
We have a cisco 3750-48 port switch.We have a few SVI's configured and some static routes configured.I had created a new interface vlan and gave it an IP. I can ping the gateway.
Now I want to add a static route to go out that interface.when I add: ip route 10.x.x.x 255.255.255.0 10.52.10.1
it eccepts it (no errors) But, it does not show in the routing table nor in the config? How to add the static route to go out that vlan interface.
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Jan 9, 2012
Any method of forcing a non connected switch port LED to blink for a certain number of times regardless if there is anything connected.The purpose of this is we have remote 3750 switch stacks and quite often have to tell non technical staff to patch to a certain port. It would be much easier if we could say "Connect it to the empty port which just started blinking orange" as the port numbers are difficult for them to see in these locations.A similar feature is available in the ethtool package for linux which makes it really easy for identifying ports on servers. It would be great if a similar feature is available on Cisco switches.
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Nov 14, 2012
What the different between using hsrp on vlan interface and on physical port (routed port) on Cisco 3750 Switch? Wha the benefits?
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Jul 18, 2012
I have 2 x 3750 stacked, the port number of the master switch is gigabitEthernet2/0/1, slave as gigabigEtherent1/0/1.
Can I change the port numbering so that the master switch gets GigabitEthernet1/0/x?
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Jul 23, 2012
I have found some samples on the FlexConnect setup for the controller side. However none of the documents mentioned how the switch port should be configured that goes to the controller and AP.
At this moment I have a Cisco 5508 configured in CAPWAP mode with 20 APs. I would like to use same controller for connecting one of the remote sites with 2 APs in FlexConnect mode. Current the 5508 to switch port is configured as 802.1Q port. All CAPWAP AP ports are configured as "switchport access vlan X" where X=capwap VLAN. Need to know how the switch port should be set for the remote site where flexconnect APs connect.
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Feb 17, 2011
I have an old Cabletron switch i have used for about 8-10 years, it has some vlans set up and i was wondering how i can "talk" to the switch and set it up. I am using this switch in my home on my vast network. is it possible to "reset to factory" or anything without a serial cable? I would like to use snmp of telnet to configure but i dont think it has an ip set up and it is such an old switch I cannot find any info from entrasys.
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May 21, 2012
We have a stack of switches that is at the max number of members allowed in the stack. Problem is we are running out of port density and need to add more ports. So instead of adding a whole new stack I would rather replace 2 of the 24-port swicthes with 48-port switches.
If the two 24-port swicthes we are removing are stack members and neither of them are the stack master, I should be able to replace the 24-port switches with the 48-port switches without bringing the master offline? If the new 48-port switches are running the same IOS version as the current 24-port swicthes, they should add themselves to the stack?Would I have to tell the new 48-port swicthes what switch numbers they are replacing in order for them to be added to the stack since we are at the max number of members?Also since the 48-port swicthes are replacing 24-port switches will the master give the 48-port switches the configuration for only the 24-ports?
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May 12, 2013
I have a laptop with a single physical NIC which I have used the advanced management tools to create two virtual NICs (say vlan 10 and vlan 20) and both are on the same subnet (say 192.168.4.x). One NIC is for normal TCP/IP traffic and one is for broadcast/multicast traffic (I have some custom software that requires this to be the case and works fine on an older laptops with built-in physical NIC and PCMCIA XIRCOM NIC). The dual NIC laptop communicates with a dual NIC server via a Cisco 2811 router (which has a 16 port switch module at the back) and has vlans set up so.
What I want is for the single NIC laptop (with two virtual NICs) to be able to also communicate with the server. Basically, one NIC is for normal traffic and one is for multicast/broadcast traffic. All three machines need to be able to talk to each other using the NIC for normal traffic and both laptops must be able to receive broadcasts from the server. What is the best way to configure the router to handle the trunking/tagging? Most configuration documentation I read has two complete subnets for the two virtual NICs. Note that all three machines use static IPs and are part of a workgroup so no DNS and domain servers etc.
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