[SR-Users] Issue with Dispatcher Failover algorithm

Daniel-Constantin Mierla miconda at gmail.com
Thu May 25 17:04:08 CEST 2017


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
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