Cisco Switching/Routing :: 3750 As A Port Channel Bridge?

Dec 7, 2011

I have 3750 core/distribution switches with routing enabled in two offices connected with copper link and L3 port channel interfaces. NewOffice#2 has moved about 5 miles farther away from office#1 and I have to deploy new core/distribution switch connect it to old core#2 via F.O and move all access switches with it. Old core will stay in old #2 offices as a bridge between office#1 and new office#2 Office#1core<->copper (Ethernet) <->oldoffice#2core<->f.o. <->new office#2core How I should configure port channels ports on oldoffice#2 core to act as bridge between office#1 core/dist and newoffice#2 core/dist without changing anything else (ip, etc) on whole network

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Cisco Switching/Routing :: 3750 - How To Setup Port-channel

Jan 22, 2012

I set up a port-channel trunk between a acess switch 3750 ( int gi2/0/1 and gi2/0/2) and Core 6509( int gi7/11 and gi7/12).
On the both the 3750& 6509 I configured:
interface Port-channel15
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100,103
switchport mode trunk
But the ports on the core g7/11 and g7/12 keep shutdown and when I do show interfaces port-channel 15, it show the interface is shutdown.

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Cisco Switching/Routing :: Min-Link Configuration On 3750-X Port-channel

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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Cisco Switching/Routing :: Auto Qos Dropping Port Channel In 3750?

May 13, 2012

We have a switch that, when configuring auto qos on and edge port facing video equipment, the upstream port channel drops. I was wondering if no auto qos would have to be configured on the member ports of the port channel prior to enabling auto qos on any other ports. 

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Cisco Switching/Routing :: How Many Port Channel Can Configured In Switch 3750 X

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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Cisco Switching/Routing :: Configure Port-Channel Or Physical Interface On 3750

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


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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Cisco Switching/Routing :: Replacing 3750 24 Port With 3750 48 Port?

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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Cisco Switching/Routing :: 3750 - Procedure To Modify Channel Group Settings?

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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Cisco Switching/Routing :: 3750 - Cross-stack Ether Channel 20Gb And STP

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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Cisco Switching/Routing :: Will All 4-ports Of N5K Will Be Same Port-channel

Sep 12, 2012

Have 2 N2K with dual-connections to both 2 N5K, will all 4-ports of N5K will be the same port-channel. N2K as well ?

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Cisco Switching/Routing :: Port-Channel Between 4507

Nov 29, 2011

I need to configure a port channel between two sw 4507R. with port Giga, but those port are in different modules.
interface GigabitEthernet5/48
description **** Conexion Switch-2*****


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Cisco Switching/Routing :: 6509 Trunk To Port Channel

Apr 22, 2012

I have 2 Cisco 6509 switches linked together via single Fibre as a trunk.I want to change this to a port channel where I will add another 3 fibre ports to the port channel but what order do I do this to minimise any disruption.

1-Configure PortChannel and add the 3 new ports, this will bring up the Port Channel but what effect will this have on traffic currently going over the single Trunk link? Will spanning tree go mad, how will switches react?

2-Convert existing Trunk link to Portchannel then add in new ports to PortChannel, I guess in doing this there will be a small hit on traffic as it changes to a port channel.

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Cisco Switching/Routing :: Lost Port Channel Between 6513

Feb 24, 2012

We have 2 6513's that are linked via 2 10 gig interfaces, using an LACP channel.I received an alert this aft stating that the far 6513 was unreachable and the port channel int PO3 had gone down, the 2 10 gig interfaces had also gone down on either side. 5 mins later PO3 had resestablished itself and has been fine since. [code]

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Cisco Switching/Routing :: Nexus 5018 / Port Channel Down?

Feb 7, 2013

We are running nexus 5018 in our DC.What is the difference betwen "channel-group 214 mode active"  and " channel-group 216" Any difference?.. because i have problem with this config we are going build a server config? 
We have problem with porth channel down.
5K# sh int po71
port-channel71 is down (No operational members)
vPC Status: Down, vPC number: 71 [packets forwarded via vPC peer-link]

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Cisco WAN :: Load Balance Of 3750 Port Channel?

Jul 17, 2011

What is the load balance method of 3750 port channel ( by source ip , or by source mac ) to diver traffic to paths? I have tried to use and as source ip, it will travel to the same link (G0/1) within one port channel (G0/1+G0/2). Howerver, if I later use, then this time it will traffic to G0/2 link. What's the concept behind.

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Cisco Wireless :: Port Channel WLC 5508 And 3750?

Jan 2, 2013

I want to configure Port channel for WLC 5508 and cisco 3750 Stack Switch. What changes I need to make on WLC and where?

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Cisco Switching/Routing :: VLAN Bridge With Catalyst 3750

Nov 8, 2012

I have 3 VLANs here that need to be on the same network segment.  They are going to be used by our Wi-Fi network (with Aironet APs), bound to 3 different SSIDs (as Aironet APs doesnt allow multiple SSID per VLAN), each one with a different authentication method and server.Is there a way to bridge those VLANs together with a Catalyst 3750 switch?  I tryed configuring an IP address on one of the VLAN interfaces, then configuring a bridge with the vlan-bridge protocol (Catalyst 3750 doesnt have the "ieee" bridge protocol type) and put all 3 VLAN interfaces on the same bridge-group, but it didnt work (even with "bridge x route ip").I also tryed configuring IRB bridging, with the 3 VLAN interfaces on the same bridge-group and an IP address on the BVI interface (the way I used to do with old 2600 routers).  Same result.(actually, I didint test to see if the interfaces are actually being "bridged", but I see neither of them can reach the router)

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Cisco Switching/Routing :: Can Port Channel In 3825 Connect To Two Different Switches

Jan 17, 2012

We have one 3825 router used as voice gateway. For redudancy, we want to connect it to two different switches which has STP and HSRP running. Can I create a port-channel with two Giga interfaces in 3825 and connect to two different switches? Should I configure port channel in switch with only one port in each port-channel? I know server can be connected to different switches with NIC teaming. I just want to mimic that kind of setup. I did one time for port-channel in 3825, but it was connected to a stacked 3750X. So it's different case now.

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Cisco Switching/Routing :: ME380x Port-channel From One Switch To Two Switches

May 8, 2013

I am trying to configure port-channel from one switch to two switchs, and only one interface of each switches make part of the port channel.Cisco IOS Software, ME380x Software (ME380x-UNIVERSALK9-M), Version 12.2(52)EY4, RELEASE SOFTWARE (fc1) [code]

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Cisco Switching/Routing :: 6500 Setup In VSS Configuration - Port Channel ID

Jan 22, 2012

I have a pair of 6500's setup with VSS and there is currently only one link between then. However one end of the link is on Po10 and the other end is on Po25.  If I move the Po25 over to Po10, will things break? It seems to be working fine now. I'm about to add a second link and I'm concerned about the current configuration.  It makes more sense to me to have both ends of the same link on the same port-channel ID.  I've seen documentation which states otherwise however.
interface Port-channel10
no switchport
no ip address


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Cisco Switching/Routing :: 3560 / Allowing Etherchannel Or Port Channel?

Mar 3, 2012

I am using 3560.IP rouitng is being turned off on this.Curious to know if I will create etherchannel or port channel.I think etherchannel.Correct me if I am wrong.On connecting switches I have vlan10,20,30 to be allowed.I am sure I need to allow these all vlan in 10,20,30 which are on the trunk port on each side switch.Post that will add channel-port lacp and make it in active mode.Is that correct.This way traffic will be load-balanced/aggregated on minimum 2 ports who are the part of this.

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Cisco Switching/Routing :: 3750s Port Channel Between Server And 2 Different Switches

Jan 27, 2013

Here's what I'm trying to do.  We are having new storage servers installed that will be using NFS.  I'm being told that they need to have their connections port channeled.  Right now, the servers have connections to 2 different 3750s for HA. Is it possible to configure a port channel between these 2 connections?

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Cisco Switching/Routing :: C2960 - Port Channel Load Balancing?

Apr 15, 2013

I have an inquiry about a configuration I deploy in a C2960 switch. I have configured a ether channel with 8 ports, the load balanced method is source mac address. The bundling protocol is LACP.
I have found the ether channel is not balanced as I expect. One of the eight interfaces is congested.

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Cisco Switching/Routing :: 6500 Redundant Supervisor Port Channel?

Oct 30, 2011

I have a Cisco 6500 series switch with VS-C6509E-S720-10G ,I have two redundant supervisors between two chassis on the LAN with no add-on line cards ?

I need to know if I can use the redundant supervisor 10 Gb uplinks to form a layer-2 Port channel between the two 6500 switches as i do not want to use want to keep the port idle additionally I need more bandwidth between the two switches for my server farm?

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Cisco Switching/Routing :: 6500 STP Config On Port-channel Best Practice

Apr 3, 2012

I have 2 cisco 6500 in a VSS configuration , All of my Lan access switches are Stack switches and every Stack is connected to the VSS in a Port-channel so basically this is a loop free environment with no blocked ports .As a best practice I left STP in the Background (mstp)which enhanced cisco features to STP should I configure on the Aggregator (6500-VSS) and on the Access switches ?
Because of my topology I dont see the need in configuring most features like Uplink Fast and Backbone Fast but I have configured Loop Guard in addition to UDLD on the 6500 Aggregation Switches (on the port-channels).On the access ports I have configured portfast , bpduguard and guard root (seems a little pointless to configure the two...)
1.should I Leave UDLD on and get rid of LoopGuard and configure Guard root instead ? since LoopGuard cannot be configured with Guard Root.
2.should I configure GuardRoot on access ports if I already have BpduGuard on them ?
3.Is there anything I need to configure on the physicall interface or is everything configured on the port-channel since STP reguards port- channel as a single interface ?

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Cisco Switching/Routing :: Create A Port Channel Between HP Servers (4 Nic) And Two Nexus 2k?

May 9, 2012

I am trying to create a port channel between HP servers (4 nic) and two nexus 2k.  The server side its a single team with 803.2ad fault taulerence and on the nexus side it have created two port channel (port channel 1 for nexus 2k1 and port channel 2 for nexus 2k2) and made them ACTIVE (channel group mode active)
But when i add a another server on different ports and port channel them the same way as the above server on nexus 2k1 and nexus 2k2, the first server stops pinging. so i have to sht down the first port channel and reopen them - then it works, however it says NO NETWORK ACCESS on the servers (running windows 2008). the only way is to reboot the server  i cant be doing this on a production network.

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Cisco WAN :: 40Gb Port-Channel Between 3750-x Switch Stacks?

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.

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Cisco Switching/Routing :: 3750 STP Vlan 21 And 22 Root Bridge On 2 Switches

Feb 16, 2013

I config vlans 21-23 on 3750 A and B switches.I config B  switch to be Root Bridge for all vlansspanning-tree vlan 1,21-23, priority 4096 sh span tree on B  switch 3750B#  sh spanning-tree.

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Cisco Switching/Routing :: 3750 BPDU Guard And Bridge Loops

May 22, 2013

We have an environment where users create a lot of bridge loops.  We have tried to send E-mails about it and educate the users but it is almost a lost cause at this point.  The loops are created when users don’t pay attention and they plug a patch cable coming off of an access port up to ANOTHER access port by mistake.
All of our access ports are from 3750 stacked switches.  The way we tried to deal with this in the beginning was with BPDUGuard and ERRDiable (BPDUGuard) auto recovery.  We turned BPDUGuard on globally and left BPDUGuard auto recovery at the default value (I believe it was 30 seconds). so a loop would be detected and after 30 seconds, the switch would try to enable the port and if the loop still existed, close the port for 30 more seconds.  Then we started having problems with printers getting "fried".  Their NICs would die out and the control board would need to be replaced.  After a lot of troubleshooting and testing, it was determined that allowing the ports to come out of ERRDisabled state would flood the network and the packets would generate in the millions per second range and fry the NIC of these printer.
The fix for this and saving the printers was terrible.  We removed ERRDisable auto recovery and just let the ports that are looped stay in an ERRRDisabled state.  We wait for the user to figure out the loop and try to use the port and then put in a work order.  Then we physically visit the site and verify the port was shut (ERRDisabled) from a loop and we bounce the port (shut/no shut) and everything is resolved. I did lab tests with a switch looped and a printer on the switch and watched it fry.  We have had no printers fry after we removed the auto recovery protocol at every location.  Only the locations where loops existed and auto recovery protocol running were printers going bad.  What I found during my lab tests was that each time the port was auto-recovered (yes, for that millisecond while it checks if a loop still exists), more packets were re-generated and eventually enough was re-broadcastthat printers would go down.  We never had a problem with computer NICs.  I guess the cheaper printer NICs couldn’t handle the broadcast storms created by this.  I tried playing with the auto recovery timers and even the highest setting would eventually re-create these storms.
 So my question is what best practices are others using?  Should we get rid of BPDUGuard and just try to let spanning-tree handle these bridge loops?  Is there something else I can try?  I’m not CCNA by any means, just trying to do what I can in my environment.  Manually visiting sites when loops occur is becoming more and more my job, though and I have plenty of other things to be doing.

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Cisco Switching/Routing :: 671610GE / 10GE Port Channel Using Sup And Line Card?

Jan 17, 2012

Is it possible to use a 10GE interface on a sup720 and an interface from a 671610GE line card and create a port channel. I haven't found specific documentation on CCO stating you can. I have found the QOS queuing is differnet between the sup and line card.

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Cisco Switching/Routing :: 6500 - Adding VLan To Trunk In Port Channel

Jan 20, 2012

I need adding a vlan to the trunks bundled in port channel. I know how to add v lans to a port channel with Cisco IOS but with CAT OS.

I have 2 ports bundled to form ether channel in switch which is running CAT OS. There are already few v lans allowed in the trunk of each interface. now I need to add one more v lan.

For Example:- 
v lan 135 needs to be added in addition to the existing v lans.
clear trunk1/2 1-112,115,117-134,136-4094
set trunk 1/2 on dot1q 113-114,116,135
and similarly on the 2nd interface
so if I add vlan135 to the trunk one after another will it cause any service disruption?

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Cisco Switching/Routing :: Nexus 5548 - Hardware Port Channel Resource

Mar 30, 2012

I am having hard time in understanding the hardware port channel resource concept in Nexus 5Ks. Which scenario is considered as a hardware port channel and which is not. According to Cisco documentation, 5548UP switch with layer 3 daughter card only supports 8 hardware port channels, does this mean we can connect only 8 dual homed Fex to those 5Ks.Will a dual homed fex consumes a hardware port channel?

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Cisco Switching/Routing :: 6509E Port-channel Flapping When Two More Links Are Added?

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, 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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