From: Ruhann (groupstudy@ru.co.za)
Date: Thu Feb 19 2009 - 16:41:20 ARST
Thanks :)
But I have come to trust the old man's word above most other prints.
Regarding your question, I believe the answer, although extremely
non-optimal would be based on the switching pair between the input & output
interface
Have a look at this link : (check the word-wrap)
http://www.ciscosystems.com/en/US/products/sw/iosswrel/ps1828/products_tech_note09186a00801e1e46.shtml
Regards
On Thu, Feb 19, 2009 at 12:16 PM, Nadeem Ansari
<nadeem.ansari574@gmail.com>wrote:
> Hi Rauhann,
>
> I also done lots of exercise regarding load sharing by router and found
> that CEF by default do per source/destination load balancing and process
> switching do per packet load balancing
> Mr. Doyle and You both are correct.
>
> Hi Experts,
>
> But I also faced one strange scenario where you have four paths to a
> destination network and two path of them are configured with "no ip
> route-cache" to enable process switching and remaining two are CEF enabled,
> in this case what will happen CEF behavior will take over or process
> switching behavior will take over, As per my observation CEF behavior will
> take care of load balancing, Need your aopinions
>
> Regards
> Nadeem
>
>
>
> On 2/17/09, ALL From_NJ <all.from.nj@gmail.com> wrote:
>>
>> Hello, hope all is well with you.
>>
>> The link to the IP switching section is:
>>
>> http://www.cisco.com/en/US/docs/ios/ipswitch/configuration/guide/12_4/isw_12_4_book.html
>>
>> There are some interesting options for these commands, cef in particular.
>>
>> IMO, you do not need to memorize any of this, the docs seem pretty clear
>> for
>> this and as long as you know where to find this info, should be a few easy
>> points.
>>
>> This link will help, although it probably will not answer all your
>> questions. It is pretty helpful though.
>>
>>
>> http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_tech_note09186a00801e1e46.shtml
>>
>> HTH,
>>
>> Andrew Lee Lissitz
>>
>>
>>
>>
>> On Tue, Feb 17, 2009 at 5:31 AM, Ruhann <groupstudy@ru.co.za> wrote:
>>
>> > Hi
>> >
>> > Guys, please correct on the following
>> >
>> > In the event of load-sharing, ie one router with 2 link to another
>> > By default routers running IOS 12.4 and later have CEF enabled by
>> default
>> > on
>> > most interfaces.
>> >
>> > Default CEF will use per source/destination load-balancing,
>> > CEF per packet can be enabled with "ip load-sharing per packet"
>> >
>> > Then, you have fast switching and process switching:
>> > Fast Switching (enabled with no ip cef and ip route-cache) does per
>> > destination load-balancing only
>> > when Process Switching (enabled with no ip route-cache) does per-packet
>> > load-balancing again.
>> >
>> > Please verify if above is correct, reason I asking, is I have found more
>> > descrepencies with the DOC-CD,
>> > claiming default cef does per dst only, but mr Doyle says it does per
>> > src/dst.
>> >
>> > (I have come to trust the Mr Doyle's teaching over the Doc-Cd, even
>> though
>> > his articles any not only cisco related.)
>> >
>> > PS I did not mentioned here is the switching mechanism on the input
>> > interface, as I am only after the differences conceptually.
>> >
>> > Regards
>> > --
>> > <ruhann>
>> >
>> >
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>> >
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>> >
>> >
>>
>>
>> --
>> Andrew Lee Lissitz
>> all.from.nj@gmail.com
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
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>
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