[cisco-voip] Load Balance between SIP dial-peers

[Erick Bergquist]

In the one I mentioned, we accomplished load-balancing by configuring
'dial-peer hunt 1' globally.

And here are the dial-peers ...


dial-peer voice 100 voip
 description Calls from PSTN to IVR1
 application session
 destination-pattern 5551234567
 session protocol sipv2
 session target ipv4:1.2.3.4:5060
 dtmf-relay rtp-nte
 codec g711ulaw
 no vad
!
dial-peer voice 102 voip
 description Calls from PSTN to IVR2
 application session
 destination-pattern 5551234567
 session protocol sipv2
 session target ipv4:1.2.3.5:5060
 dtmf-relay rtp-nte
 codec g711ulaw
 no vad

dial-peer hunt ?
<0-7> Dial-peer hunting choices, listed in hunting order within each choice:
*0 – Longest match in phone number, explicit preference, random selection.
Default*
1 – Longest match in phone number, explicit preference, least recent use.
2 – Explicit preference, longest match in phone number, random selection.
3 – Explicit preference, longest match in phone number, least recent use.
4 – Least recent use, longest match in phone number, explicit preference.
5 – Least recent use, explicit preference, longest match in phone number.
6 – Random selection.
7 – Least recent use.


On Thu, Dec 10, 2009 at 8:37 PM, Nick Matthews <matthnick at gmail.com> wrote:

> It should.
>
> The only factors in an outgoing dial peer are:
>
> destination-pattern
> match length against destination pattern
> cor list restrictions
> if the sip options are up
> and some other conditionals (CAC, etc)
>
> IP addresses are not part of the process.  It should be a random load
> balance by default, which means it's possible for two consecutive calls to
> go to the same place that could give that impression.
>
> -nick
>
>
> On Thu, Dec 10, 2009 at 7:41 PM, Eric Pedersen <eric.pedersen at sait.ca>wrote:
>
>>  I used DNS SRV records for sip targets.  They work nice because then you
>> don’t need to duplicate dial peers for each sip target, as long as you’re ok
>> with a dependence on DNS.
>>
>>
>>
>> When I did it, I set one record to have a higher precedence, so I don’t
>> know what the behaviour is if multiple targets have the same preference –
>> i.e. if IOS load balances or not.
>>
>>
>>
>> *From:* cisco-voip-bounces at puck.nether.net [mailto:
>> cisco-voip-bounces at puck.nether.net] *On Behalf Of *Ali El Moussaoui
>> *Sent:* December 9, 2009 23:53
>>
>> *To:* Hussam Ahmad
>> *Cc:* cisco-voip at puck.nether.net
>> *Subject:* Re: [cisco-voip] Load Balance between SIP dial-peers
>>
>>
>>
>> Its one router connected to 2 different targets and i think what Mark
>> mentioned is true.
>>
>> On Wed, Dec 9, 2009 at 7:03 PM, Hussam Ahmad <hahmad at sigma-it.net> wrote:
>>
>> OK, could you please describe the topology?
>>
>> do you have two routers with two links in-between or one router connected
>> to two routers?
>>
>>
>>
>> Thanks and best regards,
>>
>> * *
>>
>> *H**USSAM** A**HMAD*
>>
>> Cisco Instructor | Sigma IT – Saudi Arabia
>>
>> [image: LOGO6.png]
>>
>> Olaya St., Akaria 3, Entrance 13, 5th Floor, Office 509 | Riyadh | KSA
>>
>> Tel: +966-1-2150100
>>
>> Fax: +966-1-2151090
>>
>> Mobile: +966-55-3266244
>>
>> Email: hahmad at sigma-it.net
>>
>> Website: www.sigma-it.net
>>
>>
>> ------------------------------------------------------------------------------------------------------
>>
>> This e-mail communication and any attachments thereto contain information
>> which is confidential and are intended only for the use of the individuals
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>>
>>
>>
>> *From:* Mark Holloway [mailto:mh at markholloway.com]
>> *Sent:* Wednesday, December 09, 2009 7:57 PM
>> *To:* Hussam Ahmad
>> *Cc:* 'Ali El Moussaoui'; cisco-voip at puck.nether.net
>>
>>
>> *Subject:* Re: [cisco-voip] Load Balance between SIP dial-peers
>>
>>
>>
>> Are you sure about that?  The expected behavior when creating two dial
>> peers with identical destination patterns but different session targets is
>> the lowest numbered dial peer is always used first and if the session target
>> is not available the next dial peer is used.  Although this does provided
>> redundancy it's not load balancing.
>>
>>
>>
>> On Dec 9, 2009, at 1:46 AM, Hussam Ahmad wrote:
>>
>>
>>
>> Configure the dial-peers without any preference and it will work as you
>> want if the destination-pattern is the same.
>>
>> Make it and use debug voice dial-peer in to verify it.
>>
>>
>>
>> Waiting for your reply.
>>
>>
>>
>> Thanks and best regards,
>>
>> * *
>>
>> *H**USSAM** A**HMAD*
>>
>>
>>
>>
>>
>>
>>
>> *From:* Ali El Moussaoui [mailto:mousawi.ali at gmail.com]
>> *Sent:* Wednesday, December 09, 2009 11:43 AM
>> *To:* Hussam Ahmad
>> *Cc:* cisco-voip at puck.nether.net
>> *Subject:* Re: [cisco-voip] Load Balance between SIP dial-peers
>>
>>
>>
>> they have different session targets
>>
>> On Wed, Dec 9, 2009 at 10:21 AM, Hussam Ahmad <hahmad at sigma-it.net>
>> wrote:
>>
>> You can but why do you need it, because how the first dial-peer will go
>> down.
>>
>>
>>
>> Thanks and best regards,
>>
>> * *
>>
>> *H**USSAM** A**HMAD*
>>
>> Cisco Instructor | Sigma IT – Saudi Arabia
>>
>> <image001.png>
>>
>> Olaya St., Akaria 3, Entrance 13, 5th Floor, Office 509 | Riyadh | KSA
>>
>> Tel: +966-1-2150100
>>
>> Fax: +966-1-2151090
>>
>> Mobile: +966-55-3266244
>>
>> Email: hahmad at sigma-it.net
>>
>> Website: www.sigma-it.net
>>
>>
>> ------------------------------------------------------------------------------------------------------
>>
>> This e-mail communication and any attachments thereto contain information
>> which is confidential and are intended only for the use of the individuals
>> or entities named above. If you are not the intended recipient, you are
>> hereby notified that any disclosure, copying, distribution or the taking any
>> action in reliance on the contents of these documents is strictly prohibited
>> and may be illegal. Please notify us of your receipt of this e-mail in error
>> and delete the e-mail and any copies of it
>>
>>
>>
>>
>>
>> *From:* Ali El Moussaoui [mailto:mousawi.ali at gmail.com]
>> *Sent:* Wednesday, December 09, 2009 11:18 AM
>> *To:* cisco-voip at puck.nether.net
>> *Subject:* [cisco-voip] Load Balance between SIP dial-peers
>>
>>
>>
>> Hello Guys,
>>
>> Is it possible to Load balance between 2 sip dial-peers ?
>>
>> Ali
>>
>>
>>
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