Cisco switches don't just look at the last x bits, they use a proprietary
algorithm to do the hashing. I don't have the liberty to provide details,
however I can confirm that it's an actual algorithm and not just "last x
bits". The following document confirms too:
http://www.cisco.com/c/en/us/suppo
I don't know if cisco ever provided their official hashing algorithms
anywhere however, my guess would be take the result of whichever
fields you set to hash on, probably XORing all these fields together,
and then evenly distribute that over 'x' number of buckets depending
on the platform.
Based o
Does anyone know how etherchannel hashing works when selecting which port to
use ? When using src-mac load-balancing and iterating straight through 16
mac addresses sequentially by only changing the last hex character one
binary iteration at a time, I see port selections of
2,1,1,2,1,2,2,1,1,2,
>-Original Message-
>From: Nick Hilliard [mailto:n...@foobar.org]
>Sent: Monday, September 12, 2011 11:13 AM
>To: Jiri Prochazka
>Cc: cisco-nsp@puck.nether.net
>Subject: Re: [c-nsp] etherchannel load-balancing & WS-X6708 issue
>
>On 09/09/2011 12:33, Jiri Pro
On 09/09/2011 12:33, Jiri Prochazka wrote:
> Primary box is 6500-1 (several hunderd Vlans and SVI's) and under standard
> circumstances Po1 is the only path utilized, but even if I freak out, I am
> not able to push more than aproximately 25 Gbps from 6500 over Po3 to
> edge-2. My initial guess was
Hi,
I'm trying to establish 40 Gbps redundant cirle using a pair of 6500 and
7600 boxes equipped with X6708 cards as shown below ->
_ _
|| Te1/2 --||///
| core | Te1/1 --| edge-2 |//
| 7600-1 | Te1/5 -Po1--||/
|_ __| Te1/6 -
Correction:
Now, if your content filter X was using link A and B, and content filter
Y was using link *C and D*, you might find for these 4 flows that Y
looks to be failing 100% of the time, and filter X seems to be failing
50% of the time.
Regards,
John Gill
cisco
On 7/20/11 11:27 AM, John
Hi Steve,
That is correct, each switch decides where it hashes in the *tx*
direction. The return traffic hashing is decided by the other switch,
so even if that switch uses the same hash inputs (src-dst-ip for
example), there is no guarantee it will take the same link when the
platforms are n
s.k12.oh.us]
> Sent: Wednesday, July 20, 2011 9:11 AM
> To: David Prall; 'Keegan Holley'
> Cc: cisco-nsp@puck.nether.net
> Subject: RE: [c-nsp] etherchannel load-balancing and unpredictability
>
> Yes, that's correct. Either content filter should be able to handle
Yes, that's correct. Either content filter should be able to handle all
of the load if it needed to. The goal was mainly redundancy.
If we swap the links so interface 1 on one switch goes to interface 2
on the other and vice versa, would that help?
Steve Pfister
Network Engineer
Office of Info
On 7/19/2011 8:22 PM, Keegan Holley wrote:
> The being said the other algorithms are just as unpredictable for just
> the same reasons. It depends completely on your traffic patterns.
> Adding TCP/UDP port may even this out a bit but I don't believe it is
> supported on the 3560.
3550: (config)#po
On Behalf Of Keegan Holley
> Sent: Tuesday, July 19, 2011 8:22 PM
> To: Steven Pfister
> Cc: cisco-nsp@puck.nether.net
> Subject: Re: [c-nsp] etherchannel load-balancing and unpredictability
>
> 2011/7/19 Steven Pfister
>
> > I have a question regarding etherchannel lo
2011/7/19 Steven Pfister
> I have a question regarding etherchannel load balancing. I've got a
> 4507R switch connected to a 3560 switch by means of two content filters
> which are acting as transparent bridges. The two ports on each side that
> the content filters are connected to are set up as
Hi Steven,
If the balance method is configured for src-dst IP, a given src/dst ip
pair will always use the same link, if the number of links in the
channel does not change. If more links are added, or gets removed, the
same ip pair might start using another link.
You can check the result of the l
I think I kind of see what you mean. For a given source/destination ip
address pair. Switch A might always select path 1 every time going to
switch B, but on the return trip, switch B might select path 2 every
time going back to switch A. Something like that?
But if that were the case, would that
Hello Steve,
The port selection function is based on a hash of the inputs, in this
case the source and destination IP address, and the output is a value
that chooses a member interface.
These functions between the input and output vary by platform, but for a
given platform you can expect with
I have a question regarding etherchannel load balancing. I've got a
4507R switch connected to a 3560 switch by means of two content filters
which are acting as transparent bridges. The two ports on each side that
the content filters are connected to are set up as access ports and are
in an ethercha
Hi all
I'd like to know if is possible to achieve equal load balancing on 3560-E-TS
switch.
Basically I got 2 switches interconneted with 2 FE ports. 200Mbps is
desirable throughput between themselves. IP routing enabled. CEF not
enabled.
port channel is L2 trunk dot1q.
I have 2 VRFs
VLAN 100 - S
On Thu, 2010-06-24 at 14:41 +0100, Ivan Šimko wrote:
> On 24 June 2010 14:16, Billy Guthrie wrote:
> > Document may or may not help:
> >
> > http://www.cisco.com/en/US/tech/tk389/tk213/technologies_tech_note09186a0080094714.shtm
>
> thanks a lot. Can you send me that doc? Link isn't working :-(
From: cisco-nsp-boun...@puck.nether.net
[mailto:cisco-nsp-boun...@puck.nether.net] On Behalf Of Ivan ?imko
Sent: Thursday, June 24, 2010 4:41 PM
To: Billy Guthrie
Cc: cisco-nsp@puck.nether.net
Subject: Re: [c-nsp] Etherchannel load balancing
Hi Billy
thanks a lot. Can you send me that doc? Link isn't
Hi Billy
thanks a lot. Can you send me that doc? Link isn't working :-(
Regards
Ivan
On 24 June 2010 14:16, Billy Guthrie wrote:
> When you configure an etherchannel bundle, the frames are distributed
> across the individual bundled links deterministically; however, the load is
> not balanced
When you configure an etherchannel bundle, the frames are distributed
across the individual bundled links deterministically; however, the load
is not balanced equally across all the links. You may or may not know,
but the frames are forwarded on a specific link due to the hashing
algorithm that
Hi all
I've got two switches 3560
group with 2xFE on both switches and inteconnected together.
port channel is L2
2 VRFs - ivan, mark
4 VLANs:
- vlan 100 VRF "ivan" for interconnection between swtiches
- vlan 11 VRF "ivan" for customer's connection
- vlan 200 VRF"mark" for interconnection between
Jan Sandmaier <> wrote on Thursday, April 09, 2009 13:32:
> Hi,
>
> does anybody know how load-balancing in an etherchannel works on a "4
> Port ISE Gigabit Ethernet" for Cisco 12000 in detail?
>
> I have the following problem: I configured an etherchannel consisting
> of two GigabitEthernet por
Hi,
does anybody know how load-balancing in an etherchannel works on a "4
Port ISE Gigabit Ethernet" for Cisco 12000 in detail?
I have the following problem: I configured an etherchannel consisting of
two GigabitEthernet ports on the same linecard. Only one port is
utilized (see show command
On Fri, Oct 03, 2008 at 12:39:31PM +0100, [EMAIL PROTECTED] wrote:
> configuration of your network... eg, in this case,
> if a server is on the network and all clients
> is on a different network, then as far as the cisco
> is aware, then all traffic in that scenario will
> look the same to the lo
Hi,
> We are doing etherchanel between two a Cisco catalyst 4509 switchs but load
> balancing is not working On the one link we have about 700M and on the other
> 60M. The configured load balancing method is the default which is
> (src-dst-ip).
>
the method you need to use to get proper/ef
Hello all
We are doing etherchanel between two a Cisco catalyst 4509 switchs but load
balancing is not working On the one link we have about 700M and on the other
60M. The configured load balancing method is the default which is (src-dst-ip).
Any ideas?
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