Cisco Switching/Routing :: 2960S Stacks / 3750 - EtherChannel Group Numbers?
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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Jan 30, 2013
I have 2 3750 switch stacks which I would like to have redundant trunks between them. This will provide two physical connections traveling through different geographical locations for redundancy in the event that a cable is severed. I couldn't find anything in regards to setup/config. Does it matter if I go stack1/switch1 to stack2/switch1 and stack1/switch2 to stack2/switch2 or should they cross to opposite switches like a stack cable? I don't think that should be necessary, but couldn't find any documentation. Should there be an issue with loops?
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Jan 15, 2012
I am trying to configure etherchannel on 2 2960S connected by a flexstack with 2 ports g1/0/52 and g2/0/52 on each 2960.
these switch are connected to a CAT4500, I know that I can only use LACP because of cross-stack but when I force the switch to use LACP witch channel-group 2 Mode active the switch do this :
%With PAgP enabled, all ports in the Channel should belong to the same switchCommand rejected (Port-channel2, Gi1/0/52): Invalid etherchnl mode
% Range command terminated because it failed on GigabitEthernet1/0/52
I don't know how to bundle the 2 ports on the 2960 stack. each time I use : channel-group 2 mode on there is no error
but the switch do this :
*Mar 1 00:45:32.290: %EC-5-CANNOT_BUNDLE2: Gi2/0/52 is not compatible with Po2 and will be suspended (trunk mode of Gi2/0/52 is dynamic, Po2 is trunk)
*Mar 1 00:45:32.531: %EC-5-CANNOT_BUNDLE2: Gi2/0/52 is not compatible with Po2
[Code].....
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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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May 19, 2012
We have two 6k5 configured as vss and it is working fine. For each floor we have a 3750 stack. In each 3750 stack we have 4 switches. From the first 3750 we have a fiber link to the first 6k5 and from the fourth switch we have another fiber link to the other 6k5 switch, for each floor/3750 stack, both configured as etherchannel. We installled each 3750 stack/floor in different maintenance windows; in all these installations we have problems configuring the etherchannel. After we configure the etherchannel on 3750 stack and in the vss, the etherchannel does not go up/up. We see the etherchannel up/down; after a lot off work, try and error, configuring shut/ no shut, adding and excluding links from the etherchannel; in any aleatory moment the etherchannel goes up/up and works fine. Is there any bug related with these IOS versions, or is there any right procedure to configure etherchannel from vss to 3750 stack?
3750 stack config (IOS
Cisco IOS Software, C3750 Software (C3750-IPBASEK9-M), Version 12.2(50)SE1, RELEASE SOFTWARE (fc2))
interface GigabitEthernet1/0/1switchport trunk encapsulation dot1qswitchport trunk allowed vlan 100,101,371,372switchport mode trunkchannel-group 1 mode on!interface GigabitEthernet4/0/1switchport trunk encapsulation dot1qswitchport trunk allowed vlan 100,101,371,372switchport mode trunkchannel-group 1 mode on!interface Port-channel1switchport trunk encapsulation dot1qswitchport trunk allowed vlan 100,101,371,372switchport mode trunk
[code]....
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Feb 17, 2013
seeking for configuration assitance on etherchannel between catalyst 3750 and 6506
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Jul 6, 2012
I was configuring link aggregation between a Cisco3750 and Cisco SG200 and the switched network went down just a few minutes after the port channel came on.I rebooted the SG200 and all hosts came back up for a minute before I lost them again. The etherchannel was between two trunking ports. I never set link aggregation on the SG200, could that be the reason? All machines are connected to the SG200. The 3750 is only being used as a layer 3 device for inter vlan traffic.
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Jun 20, 2012
We have a new building where we added 3 network closets with 3750x stacks.We have 2 fiber gig ports connected to 2 microwave units and etherchanneled the to ports
We have the same setup at the corporate office except the connection is 2 fiber gig ports on a 6509. The 6509 is doing the routing
Now the problem is that we lost the connection to the management interface on only one of the three closets after a few days running. But some workstations at the corp office could reach it... others could not. The workstation were on the same VLAN. We solved the problem for a few days by shutting on of the fiber ports on the etherchannel. But is started happening again... now with PCs being installed at the new location.
The PC that was not working on the 3750x side could ping across to the 6509 but no further then that. It seems like an arp issue not routing because some devices are reachable and fully operational throughout the network.
Here is the configuration:
3750x:Cisco IOS Software, Version 12.2(55)SE1
Current configuration : 118 bytes!interface Port-channel1switchport trunk encapsulation dot1qswitchport mode trunkno snmp trap link-statusend
!interface GigabitEthernet1/1/1description 2gig to STB-6509switchport trunk
[Code]......
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Jun 4, 2013
I'm trying to configure and etherchannel between 2 switches. A 3750 and a 3750G, but the port channel is down: 3750. [code]
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Apr 23, 2013
We've installed cisco devices accross our site in the last year or so and slowing getting on top of it now. How ever our old unmanaged kit seems to be out performing it. It's most like down to my misconfiguration which has lead me to here. Below is the details of hardware and configuration between devices. 3750 Core consisting of the following stacked. [code] I've got MRTG monitoring traffic and the throughput seems to max out 24m/s,
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May 22, 2013
We are configuring a new EMC VNX, and plan to use Ether channel with our 3750x stack. We would like to configure it for both additional bandwidth and for redundancy. What is the best configuration to use? Should we trunk the channel or use switch port mode access, and use channel-group on or protocol LACP (which state active or passive)?
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Aug 5, 2012
For etherchannel of 2 links on a 3750 switch, if 1 link ever gets saturated, will the other link be used as well if the excess traffic is part of the same flow?Or that excess traffic will simply be dropped?
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Mar 26, 2012
I am wanting to etherchannel from a 3750 stack to core Layer 3 switches (also 3750) with a cable going to each core switch, I have put both core switches and the stack under a 28bit subnet mask, but I dont seem to be load balancing across both links.
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Mar 25, 2013
We have a pair of WS-C3750X-24T-S in a stack and four WS-C2960S-48TS-L in a stack of their own. There is not really anything too fancy configured (no special VLAN configuration/trunks or etc.) but the 3750 do have two ports configured as L3 for routing. We are not trying to use those ports for EtherChannel. These devices are running IOS 12.2(55)SE3 Essentially we are attempting to make an EtherChannel group using port 48 on all four of the 2960's in their stack (four ports). On the 3750 we will configure an EtherChannel group using port 23 and 24 on both switches (four ports). We then connect them up to form a four member EtherChannel.The ports on both ends are configured as mode ON and they are all 1Gb ports. I elected mode on because I understand at least one of the EtherChannel protocols will not work cross stack. What I would like to ask is whether the above configuration is possible or are we hitting some sort of limitation of EtherChannel cross stack, etc..? I cannot find anything to suggest this configration is invalid, but thought I would ask to see if I missed something in the EtherChannel articles.
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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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Nov 23, 2011
As we know there are three layer in cisco Network Model:
-Core
-Distribution
-Access
So my question is in Core / Distribution layer should i use Etherchannel between switches or use Stacking if switches are stackble.For ex: suppose I have two cisco 3750 switches . so should i use etherchannel between them or use stacking in core layer?What are the advantages and disadv of both.
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Mar 27, 2012
I have 2 6504's running HSRP as my core. They are each etherchannel'd to my Datacenter switch (3750 Stack) -- see image below.The problem i a having is with the etherchannel status:
Core1 PO11 status w (waiting)
Core2 PO11 status P(bundled)
DC11 PO48 status P -- but only to Core2 - the interfaces to Core1 are suspended. (See attached configuration documents) None of the devices have any information in the logs. I run this same configuration in my central location, but we are running Nexus 7000's. With the 6500's, do I need to split the port channels on the 3750 to allow them to negotiate the etherchannel? If I split the portchannels, are there any concerns? Should I expect to see the etherchannel status as P (Bundled) or H (Hot-Standby)?
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Jan 28, 2012
According to the following Cisco webpage, cross-stack 10-Gigabit EtherChannel is possible on the 3750 with up to two 10-Gigabit modules, using LACP: url...However, the webpage doesn't confirm if this functionality is restricted to a particular 3750 model, such as 3750E, or if it applies to all models. It also doesn't specify any particular IOS feature set. I've tried Cisco Software Advisor but it doesn't list this feature on either the 3750E or 3750-X. This is possible on the 2960-S switches (i.e. cross-stack 10gig EtherChannel)?
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Mar 3, 2013
configuring EtherChannel between 3750-X cross-stack and 6509E switch. I use two ports on 3750s, and two ports on 6509. I just need it as a trunk. For some elusive reason one port on 3750 keeps being err-disabled, and one on 6509 notconnected.
Here is what I did so far.
3750
!
interface GigabitEthernet1/0/22
description ***VSS-RNOC-link***
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 2
[code]....
Problem with :
GigabitEthernet1/0/22 is down, line protocol is down (err-disabled)
GigabitEthernet2/1/29 is down, line protocol is down (notconnect)
I tried shutting them down, then no shutting them again. Didn't work.
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Mar 5, 2013
I have 2 PE routers connected to each other via 2960S and 3750 (non-metro) switches:
[PE1] -- [2960S] -- [3750] -- [2960S] -- [PE2]
I will be sending voice and data traffic between the two and my voice traffic will be marked DSCP EF & EXP 5.
Since the 2960's and 3750's can't match on the EXP bits, I am wondering if the "mls qos trust dscp" command still works. Is the 2960/3750 able to match on DSCP even though there's an MPLS header on top of the IP packet?
I'd like to avoid having to tag my VLAN traffic on the PE and rely on COS to achieve QoS in this case.
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Feb 5, 2012
I have a new Cisco 2960 S series switch with a basic configuration that needs to be uplinked or daisy chained to a Cisco 3750 switch. I am not getting any connectivity to the network with either a straight through or crossover cable. the port remains in amber but a 'show interface' indicates that the interface is up. I can manage the switch with a PC patched into any port on the switch with a static IP address. Must be something very simple that I am missing. Outlined below is the configuration.
Refresh_SW1#sh ver
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(55)SE3,
RELEASE SOFTWARE (fc1)
Technical Support: [URL]
[Code].....
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Nov 16, 2011
We need to change the Channel-group settings in 3750 switch from Mode ON to Mode Active. We have tried once by removing the physical interfaces from the port-channel group but we lost the connectivity to the secondary switch. Any step by step procedure without losing the connectivity between switches.
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Nov 24, 2010
I understand on older IOS codes If the same hsrp group number is assigned to multiple standby groups, it creates a non-unique MAC address. Is this true on newer codes like 12.2(52)SE for 3750 & 3560?
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Nov 18, 2011
If I have two stackable switches one switch uplinks to one 6509 core switch and the other connection uplinks to another 6509 core switch, and also the other stackable switch does not connect to the core switches. Because I am using hsrp and also we are not using vss then one uplink to the core is not in used only ones is so then how does creating an etherchannel between does two uplinks to both core switches benefit me in anyway such as more bandwith and using both uplinks at the same time or I'm I wrong?
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Oct 2, 2012
I am trying to stack the following -
3750G 12S - 12.2.53(SE2 IP Services) Running EIGRP & OSPF
with
3x 3750X 48P-S - 12.2.53(SE2 IP Base License)
Doing some research, the IP Base does EIGRP on the 3750X, does it do OSPF?
If not I will have to get licence for the 3750X?
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Mar 7, 2013
On first floor, I have two stack switches and each stack has got 4 switches. they all are working fine.Now the client would like to add one more stack on the 2nd floor. But the second floor switches are different when compared to the 1st floor switches.
can you have differnt IOS among different stacks. I knew in a stack we need all the switches should have same IOS version. But in between two stacks to communicate do we need same IOS or they can be on differnet IOS?
1st floor switches have 15.0 version and 2nd floor new switches has 12.2.58. Is this ok ?
1st floor switches are 3500 series ( Note: only one one Vlan 20 we are using on the both stack switches and we would like add same Vlan 20 on to the new stack)
2nd floor switches aew 2 catalyst 2960 switches.
Note: on the second floor switches one is 24 port switch and the other one is 48 port switch. so can i make them as a stack?
We have already done cabling from 1st floor to second floor. So no problem with that at all.
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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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Mar 24, 2011
We have configuration of Etherchannel in Cisco 6509 connecting to Cisco 6513 switch, both running on CatOS. This is a group of 8 ports in 6509, due to some reasons one port in Etherchannel group went bad. I have disabled that bad port now. Now I have to delete that bad port from etherchannel group (First task) and add a new port to the group ( 2nd task). I have tried many cisco documents to completely delete the etherchannel port, but no use.
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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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Jun 9, 2013
When I try to add an IP address to a port-channel interface on a 3845 ISR I am getting an error that seems to imply that only L2 etherchanneling is possible. Am I missing something?Cisco IOS Software, 3800 Software (C3845-ADVIPSERVICESK9-M), Version 12.4(24)T8,
sfo-c3845-1#sho run int port-channel 1
Building configuration...
Current configuration : 31 bytes
!
interface Port-channel1
end
[code].....
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Feb 3, 2013
I am trying to implement an etherchannel on a cisco 2901 (IOS 15.1). i have already created the port-channel but i cannot assign the gig interface to the channel group.
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