Cisco Switching/Routing :: Stack 3750X - How To Configure Port Channel To Aggregate Two Links
Feb 18, 2013
I have two stacks 3750X on two different sites with two links L_2_L, and I want to configure the port channel to aggregate the two links.
Site A Site B
3750X -A1 --------------------------------------( )--------------------------------------- 3750X -B1
( L-2-L )
3750X -A2 --------------------------------------( )--------------------------------------- 3750X -B2
Below the configuration that I have put the two stacks.
site A
interface Port-channel5
description Etherchannel group entre le stack 3750X-A et Switch Lan_2_Lan
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 11,12,999
switchport mode trunk
switchport nonegotiate
speed 100
But the problem is only one link is Bundeled in channel group, see below
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
5 Po5(SU) LACP Gi1/0/15(I) Gi2/0/15(P)
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Feb 26, 2012
Possible to configure multichassis port-channel between a VSS and 3750X (Port-channel not in the same switch on the 3750X stack). I got it using LACP but I need Pagp to get VSL redundancy “dual-active detection pagp trust channel-group 1”. I am using the last VSS IOS version 15.0(1)SY. I can’t get the option “switch 1 preempt”, has it changed with other option?
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Mar 14, 2012
i have a VSS core that has 4 downstream links to 4 stacked switches. I connected each of the 4 links to different switch in the switch stack. I then created a port-channel that combines all the links from each switch. Is there any issues associated with this setup?
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Sep 11, 2012
I have two Core 6509E SUP2T configued as VSS and has two 48 ports fiber blades. I have two 3750s, I have two gig on each 3750 port-channle to po1 and connected to both the core, one link to each core.Now, I was asked ot add two more links on each 3750 switch to make it a total of 4 gigs on each 3750s (all 4 gig ports/uplinks will be in used an dtwo links to core one an dtwo links to core 2).when i added two additional links on 3750s and bundled them to po1, I created another port channel on core and bundeled the additional two gigs on each core to accomodate for the two additional links (ports on core switches are not consequtives).
adding these two additional ports makes the 3750 switches flap between managemnet vlan and po1.now, i am not sure if I must have added the two additional links on the core to teh current port-channel or core!? I have created another port-channel on core to accomodate for this currently!?
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Jan 15, 2012
What I am attempting to achieve is to aggregate trunk ports out of a VMware server into a single logical connection to give as much bandwidth as possible, the switches are 3750X and are three stacked together with the server connections spread across the stack. What I am not sure about is if two port channel load balance protocols can happy co-exist on the switch, by default the switch is using MAC address load balancing and Vmware wants to use IP Source load balancing. As other trunks and channels exist on the switch I don't want to make a change that will affect the other live connections if changing this is a global setting and not local on the channel.
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Jan 29, 2013
I need to tear down an existing port-channel on a 3750X running c3750e-universalk9-mz.150-1.SE3.bin. This port channel is currently down down. It has three ports in it that will be added one each to three existing port-channels, I am assuming as long as the "channel-group" command is exactly the same as it is on the three existing port-channels I should be ok just adding the new port. One point to note is that the three existing port-channels all have three ports so this will be adding the fourth port to each port-channel. I know after reading that it is a best practice for load balancing to use either 2, 4, or 8 ports for a port-channel. Also what is the command to see all ports that are in a port channel?
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Sep 24, 2012
A site that i am responsible for has the following equipment installed:
2 x 3750G Switches configured as a stack using Stackwise - Collapsed Core/Distribution Layer
5 x 2960G Switches as Access Layer switches
WAN connections into the Core/Distribution Layer are all Gigabit Ethernet over Fibre.This is a dedicated CCTV Network with 50 Cameras all streaming video into the Core (decoders connected to access switches)Each 2960G has 2 links to the Core/Distribution 3750G Switches, 1 to each switch - Gigabit.I'm running rapid-pvst on all switches, so spanning tree is blocking one of the ports and effectively halving the 2 gig bandwidth. Next year our customer is going to add in a further 50 - 60 cameras.After monitoring the current loading on the ports in use, we have suggested to the customer that the 2 connections to each should be Ether-channeled together. [code]
First interface takes commands no problem, keep getting the message that etherchannel cannot be configured across different switches in a stack when i try to put the second interface commands on.
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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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Oct 31, 2012
I have 3 switches in my 3750 X stack. I am getting the following error in the logs: %PLATFORM_STACKPOWER-4-PRIO_CONFLICT: Switch 1's power stack has conflicting power priorities. Not sure what I should do next. Below is my Stack-power configuration:
Power stack name: Powerstack-1 Stack mode: Power sharing Stack topology: Ring Switch 1: Power budget: 735 Low port priority value: 20 High port priority value: 10 Switch priority value: 2 Port 1 status: Connected Port 2 status: Connected Neighbor on port 1: c464.1308.7900 Neighbor on port 2: e8b7.4827.e680
Switch 3: Power budget: 729 Low port priority value: 22 High port priority value: 13 Switch priority value: 4 Port 1 status: Connected Port 2 status: Connected Neighbor on port 1: 2894.0fd9.9f00 Neighbor on port 2: 2894.0fd8.e200
Switch 2: Power budget: 690 Low port priority value: 21 High port priority value: 12 Switch priority value: 3 Port 1 status: Connected Port 2 status: Connected Neighbor on port 1: 2894.0fd8.e200 Neighbor on port 2: c464.1308.7900
Each switch has its own 715W power supply in it and all check out OK.
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Feb 14, 2013
Can i configure access ports into port channel on Nexus 7K switch.If possible then provide the complete configuration.....
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May 19, 2013
We were going to create a 2 port, layer 3 etherchannel between a 1002 router and a 3750X layer 3 core switch. We wanted to create bunled link between them but, now we are going to be putting a Riverbed device between the router and core switch. Because of this, would it be best to abandon the idea of creating a layer 3 etherchannel and just have 2 links from the router and core switch and have traffic load balance between the 2 links?The Riverbed will have 2 connections into it from the Core switch and 2 connections into it from the 1002 router. I was hoping to keep the layer 3 etherchannel but, do you think it would be best to create 2, /29 nets and have the router/Riverbed and Core Switch/Riverbed load balance.
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Jun 21, 2011
I have two 3750Xs for stack, and i want connect a 2960 switch on this stack with port-channel.I connect 2960 G0/1 to 3750X G1/0/24, and 2960 G0/2 to 3750X G2/0/24. [code] i try to config spanning-tree etherchannel guard misconfig, but no use finally, i have to use "no errdisable detect cause all"..i check the cisco.com, and find a information: for this case, channel-group can use mode desirble.but when i try to change the channel-group in 3750X stack, it shows me that: "with pagp enable, desirble mode must config in the same switch".i try to use mode desirble mode in G1/0/23 and G1/0/24 in 3750X stack, it still can not work.i want to know how to solve this problem? not only do "no errdisable detect cause all".
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May 7, 2013
I'm trying to review a QoS setup, and I'd like to make sure I fully understand the current setup before I change anything. I'm seeing output drops on two different queue-thresholds, but not sure how packets are making it to one of the queues.
Switch Version
CORE#show ver
Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.0(2)SE, RELEASE SOFTWARE (fc1)
System image file is "flash:/c3750e-universalk9-mz.150-2.SE/c3750e-universalk9-mz.150-2.SE.bin"
cisco WS-C3750X-24 (PowerPC405) processor (revision A0) with 262144K bytes of memory.
Switch Ports Model SW Version(code)
I can find queue4-threshold3 in the mappings, but how are packets getting mapped to queue2-threshold1? The priority queue is disabled for this interface, so I'm not sure how this queue is dropping packets, according to the maps nothing is mapped to 02-01.
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Mar 7, 2013
This 3750X stack (3 members) has some 100% cpu spikes. Is this bad enough to start tracking down the cause(s) or is this somewhat typical and not a reason for concern? I just took this reading. How can you detemine when the 100% and 80% spikes occurred?
2222233333333332222222222444442222222223333322222222222222
7777733333333338888888888000007777777770000077777888887777
100
[Code].....
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Jan 31, 2012
I recently created a stack using (2) 3750x switches. I have three vlans on the stack (1,105,241) Vlan 105 is configured on 6509 core switches with multicasting and are connected to the stack via gigabit fiber. It is working well with clients on the Master or SW1, however clients on SW2 do not participate in multicasting Any client pc that is connected to SW2 vlan 105 does not show up in the "sh ip igmp snooping group" command. I can statically assign a client on SW2 to the mcast groups but but they fail to register on their own. I can take the cable connection from SW2 and plug it into an SW1 Vlan 105 port and it immediately becomes a member of the groups. I can then connect it back to the SW2 port and it disappears from the group membership. IGMP and PIM are configured with the defaults.
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May 26, 2011
I have a 3750G and bought a new 3750X. It possible to stack these two together?
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Dec 3, 2012
Seeing very high CPU on one of our 3750X stacks. Usally its around 30% but recently its 70, 80, 90 or maxed at 100% during the main day.IOS version c3750e-universalk9-mz.122-55.SE1.bin.Has a ten gig uplink connected to a nexus 7k and another ten gig connected to another 7k. Running Layer 3 and EIGRP on the 3750X.Is this normal for the CPU?
#sh processes cpu history
5555555554444455555555555555588888666669999888885555577777
8888000001111111111222227777755555666662222222229999977777
100
90 ***** ****
80 ***** ********* *****
[code]....
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Dec 3, 2012
way to upgrade the IOS in my stack on 4 3750x switches
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Dec 4, 2012
I have a stack of three 3750X-24P-S switches. Each switch has two PSU's.If I do a SH INVENT, switch 2 only lists Power Supply 0
If, however I do a SESS 2 onto the second switch in the stack and then do a SH INVENT, it shows both power supplies. Is it anything to be concerned about?
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Feb 22, 2012
i want to realize a 20gb ring stp with 6 3750x stacked by 2. I want to install 2 3750x stacked configured in hsrp mode with other 2 3750 stacked. These 2 different stack are interconnected by a cross-stack ether channel 20Gb fiber. On the other side of the room i want to create a new stack with 2 3750x with cross-stack ether channel 20gb connected with the previous 2 stacks. So, in total 3 different cross-stack ether channel 20Gb stacks interconnected creating a ring stp of 20 Gb.
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Mar 12, 2012
I have two WS-C3750X-48PF-S in stack, but every one has just one power supply. In the package of the switches is included one stack power supply cable.does it make sense to use stack power cable if every switch has just one power supply ??
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Jun 17, 2012
Switch 2 has an interface configured in RSU Standby.Switch 3 has an interface configured in RSU active. The upgrading sequence is : Switch 2, Switch 1, Switch3.The aim of the test is to prove that there is no loss of IP connectivity throught the RSU process.During the RSU process, there are ping between all the computers.
IOS starting version : 15.0-1.SE3
IOS upgrading version (with OVERWRITE) : 15.0-1.SE3 (same version)
1rst step : Switch 2 reboot and come back master but isolated from original stack (switch 1 and 3)
2nd step : Switch 1 reboot, and come back with switch 2 into the upgrading stack.
Issue : at this step :
- Switch 1 put its interface (IP 192.168.5.254) up :
- Switch 3 has not reboot and still has its interface (IP 192.168.5.254) up
=> we have some OSPF adjencies and mac flapping issues : switch 1 and 3 are trying to mount there OSPF adjencies on the same IP. We loss our IP connectivity since step 3 is not over.
3rd step : Switch 3 reboot and come back up in the upgrading stack. The IP connectivity is back, and the RSU process is done.Is that a normal behaviour ?How can we avoid to loose IP connectivity during RSU process ?
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Aug 2, 2012
I've a situation where I need to add a new 3750x to a existing stack of 3750. [code] When I tried to stack them together, I get a version mismatch error. Is this because of the difference in SW Image? What are my options next ? My ultimate goal is to make the new switch stack correctly with the exisitng switches.
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Jul 17, 2012
I am getting a version mismatch when adding the following 3750X to the 3750 stack:
WS-C3750X-48 12.2(55)SE3 C3750E-UNIVERSALK9-M
2 0 WS-C3750-24TS 12.2(25)SEA C3750-I9K91-M
Can I upgrade the 3750's to be able to correct this? Which version does this require?
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Jan 24, 2013
IOS upgrade tried on the stack of 2XWS-C3750X-24T-S , Upgrade was tried to support WCCP on the platform. Current version is Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(58)SE1, Not able find any IP Plus ios in the site ? Only available are IP base and Universal K9 , Tried upgrading to c3750e-universalk9-tar.122-58.SE2.tar by using stack upgrade method as per document [URL]
Upgrade fails with error :
%Error opening flash:update/info (No such file or directory)
ERROR: Image is not a valid IOS image archive.
Why current ios is not supporting WCCP , I hope it is there in the featureset. ( tried "sdm prefer routing" but no success) Does c3750e-universalk9-tar.122-58.SE2.tar will give me wccp support ? What is the issue with my upgrade and how do I do a successfull upgrade ?
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Jun 19, 2012
We recently configured a stack of four 48 port 3750-x switches . We are noticing high CPU usage. "Hulc LED process" seems pretty high. This has coincided with VMware servers getting slow and non-responsive at times, perhaps a coincidence, not sure. Below I provided some outputs about how to diagnose it.
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Nov 20, 2011
if I read the Datasheet of Catalyst 3750X-Series-Switches it is possible to connect a new X-Switch to an existing and old Catalyst 3750-Series Stack.What kind of requirements are needed? Only same IOS-Version in the hole Stack and if possible same Feature-Set? .... like in a normal NOT mixed Stack?
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Apr 14, 2012
if we can stack the 3750G switch with a 3750X switch ?
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Jun 13, 2012
Our customer has a stack of 6 3750G switches. They want to add another switch to the stack. I tried to quote another G, but I got a warning that the G series is EOS January 30,2013. Can I add a 3750X to the stack? I know that no matter what switch I get, I will have to upgrade the IOS in the stack, as the stack is running 12.2(25)SEE2.
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Mar 8, 2012
I have a 3750X 24 port switch (with NM-1G network module) running IOS 15.0(1). Is there any benefit or reason to plug in the included Stack Wise cable and loop it back to itself in a single switch installation?
I don't see any recommendation in the documentation. The data sheet indicates a single switch is a non-blocking device so I'd think there's no bandwidth advantage like there is when connecting an actual multi-switch stack and needing to close the loop for the full 32 Gbps stack bandwidth.
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Jul 15, 2012
I have a cisco WS-C3750G-24TS with IOS flash :/ c3750-mz.122-ipservicesk9-25.SEB4.bin "
I purchased a new Cisco WS-C3750X-24 with the IOS flash :/ c3750e-universalk9-mz.150-1.SE/c3750e-universalk9-mz.150-1.SE.bin. ( NEW )
When i configured a stack between the two 3750, the new switch restarted due the version mismatch (different IOS´s);
We have two versions:
WS-C3750G-24TS-ipservicesk9 flash :/ c3750-mz.122-25.SEB4.bin "
VS
WS-C3750X-24 flash :/ c3750e-universalk9-mz.150-1.SE/c3750e-universalk9-mz.150-1.SE.bin.
Is that possible to configure a stack between then?
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Tenho um cisco WS-C3750G-24TS com o IOS flash:/c3750-ipservicesk9-mz.1
22-25.SEB4.bin"
Adquiri um novo cisco WS-C3750X-24 com o IOS flash:/c3750e-universalk9-mz.150-1.SE/c3750e-universalk9-mz.150-1.SE.bin.
[code]...
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Feb 7, 2012
I have two 3750X in a stack. Each 3750X has one 10Gb uplink to primary core1 and one 1Gb uplink to backup core2 configured in 2 etherchannel groups. The member switch has bad ports, so I need to replace it. I have spare 3750X unit. Is it possible to connect the spare unit to the stack and then move the RJ-45 cables from the member with bad ports to the new member? That way I can minimize servers downtime to just a few seconds..If that would work, then the last step would be to move the 10Gb networking module from old member to the new one, as well as the secondary PSU. Is it doable? Also according to the documentation, all I need to add new member is matching IOS version, correct?
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Jan 10, 2013
I would just like to confirm whether dual stack hsrp is possible or not on 3750X both stack and non-stack.
The following is that I have to take care of this on the stack?
[Catalyst 3750 Software Configuration Guide, Release 12.2(55)SE]
[URL]
%FHRP group not consistent with already configured groups on the switch stack
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