[SR-Users] Issue with Dispatcher Failover algorithm

[Cristi Constantin]

Hi Daniel,

I attached a pcap trace. It contains several SIP messages, but please check
the INVITEs from 10.224.74.36 (Kamailio) to 10.126.54.51/10.126.55.51.

Thanks for you support,
Cristian

On Thu, May 25, 2017 at 5:04 PM, Daniel-Constantin Mierla <miconda at gmail.com
> wrote:

> Hello,
>
> can you sent pcap or ngrep output with all sip messages of such case
> exposing the issue you have?
>
> Cheers,
> Daniel
>
> On Thu, May 25, 2017 at 2:18 PM, Cristi Constantin <
> cristi.constantin at gmail.com> wrote:
>
>> Hello,
>>
>> I have an issue with the behavior of ds_select_dst() method in case of
>> using algorithm 8 (dispatch based on priority). In case both destinations
>> are available, they are used alternatively, instead of always using the one
>> with the highest priority.
>>
>> By searching through the mailing list I found that the lower the priority
>> number, the higher the priority (1 is first, 2 is second, etc.).
>> Based on this, I set the following in dispatcher.list:
>> 7 sip:10.126.54.51:5060;transport=sctp 9 1
>> 7 sip:10.126.55.51:5060;transport=sctp 9 2
>>
>> After running "kamcmd dispatcher.reload" and "kamcmd dispatcher.list", I
>> have the confirmation that the priorities are correctly set:
>>                 SET: {
>>                         ID: 7
>>                         TARGETS: {
>>                                 DEST: {
>>                                         URI: sip:10.126.55.51:5060
>> ;transport=sctp
>>                                         FLAGS: AP
>>                                         PRIORITY: 2
>>                                 }
>>                                 DEST: {
>>                                         URI: sip:10.126.54.51:5060
>> ;transport=sctp
>>                                         FLAGS: AP
>>                                         PRIORITY: 1
>>                                 }
>>                         }
>>                 }
>>
>> The dispatcher settings from kamailio.cfg is the following:
>> modparam("dispatcher", "list_file", "/etc/kamailio/dispatcher.list")
>> modparam("dispatcher", "flags", 2)
>> modparam("dispatcher", "ds_ping_interval", 10)
>> modparam("dispatcher", "ds_ping_method", "OPTIONS")
>> modparam("dispatcher", "ds_ping_from", "sip:kamailio at sdp-t-lb2")
>> modparam("dispatcher", "ds_probing_mode", 3)
>> modparam("dispatcher", "dst_avp", "$avp(AVP_DST)")
>> modparam("dispatcher", "grp_avp", "$avp(AVP_GRP)")
>> modparam("dispatcher", "cnt_avp", "$avp(AVP_CNT)")
>> modparam("dispatcher", "sock_avp", "$avp(AVP_SOCK)")
>>
>> And the code which should do the displatch is the following:
>>
>>       if (ds_is_from_list(7, 3, "$ru")) {
>>           remove_hf("Route");
>>           if(!ds_select_dst("7", "8")) {
>>             send_reply("404", "No destination");
>>             exit;
>>           }
>>       }
>>
>> With the settings above, I was expecting to always have the messages
>> delivered to 10.126.54.51. Instead, they are dispathed to 10.126.54.51 and
>> 10.126.55.51 alternatively.
>>
>> Thanks a lot,
>> Cristian
>>
>>
>> _______________________________________________
>> Kamailio (SER) - Users Mailing List
>> sr-users at lists.kamailio.org
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>>
>>
>
>
> --
> Daniel-Constantin Mierla - http://www.asipto.com
> http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
>
> _______________________________________________
> Kamailio (SER) - Users Mailing List
> sr-users at lists.kamailio.org
> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
>
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