Cisco Switching/Routing :: 3750x Changing Etherchannel Load Balance Configuration
Oct 24, 2012
I am installing a several new Cisco VM servers. The VM hosts are losing connectivity when we apply the etherchannel config in the core stack. VMware has stated that the etherchannel load balance needs to be src-dst-ip in order for the etherchannel to work.However, my current stack has 2 etherchannels configured to other switches through out the bldg in network closets. The current load balance configuration is src-mac.My question....when I make the change to src-dst-ip, will my network connectivity go down? I saw there was an older article on this that doesnt provide an answer just a work around. Here is the article. [URL].
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Sep 7, 2012
I'm have ether channel between CISCO 6506 and CISCO 3750X. I'm set load-balance ip-src from 6506 side and dst-ip from 3750 side. i'm try test etherchannel for detect physical link for test ip. On 3750 all work, but on 6506 i'm get error: test etherchannel load-balance interface port-channel 1 ip 10.10.10.2 10.10.10.1 ^ % Invalid input detected at '^' marker.
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Feb 9, 2013
Ether channel: Cisco documents say Cisco uses proprietary hashing algorithm to compute a binary pattern that selects a link in the bundle. For example below a 2961 router with a switch module " NM-16ESW" performs" XOR" operation to compute the binary value to select a link.
R1#show ether channel load-balance Po1 ---> Source XOR Destination IP address.
1)Would you guys share the output " show ether channel load-balance" on your platforms?( i just want to see how different platform support different algorithm besides xor). Layer 3 ether channel on a sw.
On router, we first create ether channel and then assign int into port channel. Suppose we have a layer 3 switch and we want to put ports f1/1-2 in port channel 1. Can i configure like this: sw(con) int range f1/1-2 no switch port
channel-group 1 mode desirable. Or we must create a port channel just like we do on router and then assign ports to port channel?
Backbone fast: Suppose we have a switch with three ports, f1/1.f1/2.f1/3.
f1/1 ( root port)
f1/2( blocking)
f1/3 ( designated port).
Backbone fast is enabled on our network. Suppose sw receives a inferior bpdu on its current root port f1/1. Sw sends out RLQ on its designated port(f1/2) and Blocked port (f1/3). Suppose sw receives the rlq reply on its designated port ( f1/2). What will sw do? Will it expire the max-age timer on its root port ( f1/1) or will sw wait for all the rlq responses then expire the max-age timer on its root port ( f1/1) ?
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Mar 25, 2012
Will there be some pause in traffic on formed ether channel interfaces (4500E switch), when i will change the default ether channel load balancing method to src-dst-port (or any other non-default method)?
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Apr 25, 2012
I have 3 877 ADSL routers for internet connectivity. I recently installed a FW behind them and would like to use the Ciscos as load balance in order to get better utilization from my 3 internet links.
1) the 3 routers are on DHCP from the ISP on the WAN side.
2) the 3 ciscos are on the same class C subnet on the LAN side: 10.201.1.252, 10.201.1.253 and 10.201.1.254
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Mar 5, 2013
I'm setting up a lot of small remote sites that are only reachable via VHF ethernet radios that operate at 32k. I'm going to be using 2 of these radios shooting to two seperate base station radios to provide diversity. I'm going to have a Cisco 1941 sitting between the two radios and the way I have it configured now is to only use one radio and the second is only sitting there in case the primary fails. I was thinking though that I could load balance them to give a little more throughput. The devices at these sites are really low speed but we like to use snmp to monitor everything that is ethernet so I wanted to give as much bandwidth as I can.
Will load balancing work in this situation? What would the basic configuration be? This is all internal to our network so there are no ISPs to deal with. We're using C1900-UNIVERSALK9-M IOS will that work or will I need to change that?
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Mar 4, 2013
I have a one 3750x switch and 10 nos of 2950 switch, i want to configuration etherchanel between 3750 to 2950, for that i need 10 nos of etherchanel interface(virtual), but the 2950 switch support maximum of 6 nos of etherchanel port?
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Nov 20, 2011
Any experience with bundling a 10GB interface on a 3750G-16TD-S with a WS-C3750X-48T-S with a 10GB interface. I have worked with 5 different TAC engineers and so far I have not gotten an answer on why the switch will not let me bundle the 10GB with another 10GB interface.
Same switch Stack – not a cross stack.
Tried every configuration possible with no luck. I originally thought it might be the stack-ring speed – I corrected that today and it is running at 32GB –
The only thing I can think of now is it might be a hardware limitation on the 3750G-16TD-S ?
Q. What performance of the 10 Gigabit Ethernet port on the Cisco Catalyst WS-C3750G-16TD switches?
A. The Ten Gigabit Ethernet uplink on the Cisco Catalyst WS-C3750G-16TD switches is 1.25:1 oversubscribed and provides maximum throughput of 8Gb/s. –
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Dec 18, 2012
We have to cisco WS-C4900M with Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-IPBASE-M), Version 12.2(53)SG5, RELEASE SOFTWARE (fc1).We have four gigabit link connected between those two switches.We have create a LACP port channel with those four ports on both switches. Ether-channel is up and running and defined with a load-balancing method of src-dst-ip.But when we test the load-balancing, it's not using the src-dst-ip rule with the XOR: [code]
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Apr 16, 2012
Have two ACE 4710 in HA setup. We would like to setup HTTPS loadbalance(actually just a primary and standby configuration in the serverfarm). Initially this would be for Exchange OWA connections but may expand to more HTTPS connections later. I know there are several ways to do SSL with the ACE( client, server, end-to-end). I am just wanting to know the easiest way to deploy this? Is a certificate always needed on the ACE for each connection? In HA mode would a certificate be needed for both or does it replicate in some way to the other ACE?
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Jan 28, 2013
I have been experiencing some issue with a portchannel interface.I have two cisco switches 3560 and I have a portchannel between them ( It is composed by two gigabitethernet interfaces generating a portchannel of 2 Gigas ).Unfortunately, I am verifying that one interface traffics about 893MB but the other interface only traffics about 100MB.Is there any cause why is this happening? I thought that maybe both interfaces would traffic about 450MB.Is there some wrong configuration with the load-balance command?. At this moment there is no load-balance, It is only configured the port channel with the default configuration.
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Dec 10, 2008
We have :DSLT-1 I want to route all VOIP traffic and traffic to one IP address over the T-1, all other traffic I want to route over the DSL. HOWEVER, in the event that the DSL fails, have the DSL traffic failover to the T-1.I have setup the router to do just that (I think) and when I go to a site like "whatismyipaddress.com", it shows my IP as comming from the T-1. With the setup I described that traffic should always route over the DSL.Straight up protocol binding won't work because the traffic I want to route over the T-1 to one specific IP is going to be prot 80 and 443 (web traffic)
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May 8, 2013
I have probem with symmetric load balancig, in case when both ends of ether channel are on the sam switch (we are using VLAN translation).We need to create L2 port channel with both ends on same switch (Cisco WS-C4500X-24X-ES), for example:Po1 – Gi0/1, Gi0/3 (one end of port channel )Po2 – Gi0/2, Gi0/4 (other end of port channel)On ports in Po2 we will configure VLAN mapping.My question is what is the best ether-channel load-balancing scheme with wich we can accomplish full symmetry in both directions? For example, if traffic in one direction goes through Gi0/1 (member of Po1), in other direction also must go through Gi0/1. This is required because we need to connect four appliances for DPI (they are full L2 transparent) and traffic through each appliance need to be symmetric.
I can set-up src-ip, dst-ip, src-dst-ip etc. load balancing, but, actually I need src-ip on Po1 and dst-ip on Po2. Is there any way to set up different load balancing mechanism for different ether channel on same switch (4500X).
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Mar 5, 2012
Is it possible to use two different load balancing methods at each end of a port-channel between two switches?
We have a Cisco 6509 at one end of the port-channel and a Cisco blade switch 3020 at the other end. Right now, we are using "src-dst-ip" at both end of the port-channel. We would like to change this. That is, we would like the #3020 switch to use "src-dst-ip" while the 6509 switch should use the "src-dst-port".
Why we want to do this, the reason is that we have FWSMs on the 6509. I've read that by configuring "src-dst-port" on the 6509, one can get a better performance of traffic going through the FWSM. However, the issue is that the 3020 switch does not support "src-dst-port".
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Oct 31, 2011
I've 3750X switch that isn't loading email. then I went to rommon mode and accidently for "format flash". after that I loaded 15.0 SE2 s/w on it using tftp server but it doesn't boot up with that image. flash had only .bin file after I loaded it from tftp server.
since it wasn't booting up, I did format flash again and thought to load image again from tftp server but now, it doesn't load image from tftp server.
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Feb 17, 2013
seeking for configuration assitance on etherchannel between catalyst 3750 and 6506
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May 23, 2012
I been practicing with the configuration of layer 3 etherchannel configuration and i am facing a problem here. I have two 3560 switches and i want a layr 3 ether channel configuration setup between the first 2 ports of bothe the switches. I assign IPs to the Port-channel 1 of both the switches "10.1.1.1 /24 and 10.1.1.2 /24" but i am unable to get a successful ping. what am i doing wrong. below are the configs for bothe of my switches.
3560_1
Building configuration...
Current configuration : 1274 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
[code].....
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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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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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May 23, 2012
i have made a topology in packet tracer related to etherchannel configuration.i am using 2 3560 switches and 1 2950 switch. Now what i want is to bundle up the redundant links between these 3 switches. The links fa0/1-3 between 2950_1 and 3560_1 switches have been bundled up but when i try to bundle the links fa0/4-6 of 3560_1 to fa0/4-6 of 3560_2 it wont work. i am using channel-group 1 mode desirable between the 3560 switches. secondly if i want to assign ip to port channels then it has to be of same subnet between 2 3560 switches right and it must be same between 2950_1 and 3560_1. But these 2 subnets should be different from one another.
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Aug 27, 2012
I am going to change a running 6500 switch. I am missing a best pratice doc for changing a cisco switch configuration. My question is if a startup-config has an error (due to typo mistake, or due to comands not supported on latest IOS) and I do copy tftp startup-config then what will happen ? I want to make sure when I do "reload" the switch then it should boot normally with the latest startup config !
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Jul 19, 2012
We currently have 7 Cisco 3524-XL switches (10-12+ yrs old) which are 10/100. We purchased a handful of Cisco 3750X switches to replace them going with the whole stackwise and redundant power supplies. Our current configuration on the old 3524 switches is that they have hardset all the ports on them to 100MB/FULL since devices would auto-neg to 100/Half. Since we're going from 10/100 to 10/100/1000 switches, I want things to auto-neg as I have heard in the past and experienced that things work better when it auto-neg to gigabit. My upper management is afraid since the old switches wouldn't auto-neg correctly that we should hard set all the ports on the new switches, which would be a nightmare since some ports would be hard set to 100/FULL others to 1000/FULL, etc.. We've tested just about all of our devices at auto with the switches and they've all auto-neg to the correct speed. In short, is Auto-Negotiation the way to go with the newer switches or is it still better practice to hard set your ports?
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Dec 10, 2012
I have a requirement whereby a CCTV system is being installed that will need multicast RTSP configured on the switch network. How this will be achievable on 3750X IP Services switches? if this is not possible then what switch hardware will be needed?
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May 15, 2012
I would like to know if there an specific configuration in order to apply QoS configuration in Switches 3750X for Polycoms Phones.I was reviewing the information from Cisco but mostly of them apply only for cisco phones, and just some or basic for non cisco phones.
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Jan 28, 2013
when enabling multicasting on layer 3 interfaces the CPU becomes fully utilized , is there any specific configuration should be enabled to reduce this .
Config :
Inetface vlan 100
ip pim sparse-dense
ip igmp version 3
[Code]......
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Jul 6, 2012
I am trying to setup intervlan configuration and stuck on a problem. Here are the details:
1. Switches Catalyst 3750-x (as core switch) and Catalyst 2960S (as access switch)
2. Both switches have VLAN 20 and VLAN 1 on their database and both are active. BTW, after I figure out how to properly configure interVLAN routing the native VLAN 1 will not be used anymore. This is just an initial test.
3. VLAN 20 SVI interface (IP 192.168.20.200) on 3750 is up and can be pinged from catalyst 2960.
4. VLAN 1 SVI interface (IP 192.168.170.200) on 3750 is up and also can be pinged from Catalyst 2960.
5. Catalyst 3670 can ping a client computer (IP 192.168.20.10) connected to Catalyst 2960.
6. IP route enabled on 3750
7. Trunking is enabled on etherchannel connecting both 3750 and 2960
8. Client computer in VLAN 20 (connected to 2960) can ping VLAN 20 SVI interface 192.168.20.200 on switch 3560.But, the client computer in VLAN 20 can not reach any computer in VLAN 1 and vice versa. Strangely, the switches which these computers are connected to can ping each other or any connected client copmuters without any problem as described above.
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Jun 22, 2012
I have on 3750X stack with a few vlan
--------------------------------------------------
vvlansw06# sh vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Gi1/0/6, Gi1/0/10, Gi2/0/5
Gi2/0/6, Gi2/0/37
10 LAN_10 active Gi1/0/16, Gi1/0/17, Gi1/0/19
[code]....
where are the others vlan?
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Aug 6, 2012
What is the best way to load balance traffic between an FWSM and ASA 5520? Both are attached to a 6509-E (in seperate VLANs). The problem is the FWSM doesn't support any dynamic routing protocols (in multi context mode). So with my limited knowledge I don't see a way to do this.
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May 20, 2012
Is it possible configuring load balance with three intefaces, in my router with the following features?I have three ISP, and would like balance the traffic ... Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.2(2)T1, RELEASE SOFTWARE (fc1) Cisco CISCO2911/K9 (revision 1.0) with 483328K/40960K bytes of memory.
Processor board ID FTX1613AH8D
3 Gigabit Ethernet interfaces
1 terminal line
2 Channelized (E1 or T1)/PRI ports
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
255K bytes of non-volatile configuration memory.
250880K bytes of ATA System CompactFlash 0 (Read/Write)
[code]....
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Aug 3, 2011
I am using 192.168.1.1 as database server in head office. my branch user are more than 500. all user hit at 192.168.1.1 for database. Now i want to NAT with application server 192.168.1.50 and 192.168.1.51 with load balance As some user hit 192.168.1.1 form branch but traffic go to 192.168.1.50 and some users traffic go to 192.168.1.51.
I want to do it in My core router (Cisco 3845) in Head office. How i do these two things ?
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Feb 6, 2013
So I can fail over my NAT and IPSEC VPN (DPD). I am curious can I load balance my WAN links too?
I have a route map that is used for fail over, I just can't quite think how I would load balance the links
ip nat inside source route-map 10mb interface GigabitEthernet0/1 overload
ip nat inside source route-map efm interface Vlan3 overload
ip route 0.0.0.0 0.0.0.0 213.38.xx.xx
ip route 0.0.0.0 0.0.0.0 46.226.xx.xx 10
access-list 175 deny ip 172.16.20.0 0.0.0.255 172.31.114.0 0.0.0.255
[code]....
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Mar 22, 2012
i am using two internet connection if one fails the other want to connect automatically is there any hardware.
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Apr 22, 2011
We configured sa520 load balance with 2 isp 2mb+2mb how to check the status of the load balance on sa 520 .
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