Re: [openss7] State in SCCP and MTP3

["Brian F. G. Bidulock" <bidulock@openss7.org>]

Sanjay,

I suggest you do a little reading on SS7.  Check out the book
list on the FAQ.

But here are some simple answers to your questions:

Sanjay Agrawal wrote:                 Mon, 12 Feb 2001 14:18:27
>
> Questions on SS7 :
> 
> 1) To design a highly available system, the application state
> along with the SS7 protocol state need to be shared between
> multiple nodes.

Agreed.  OpenSS7 handles the SS7 protocol state info (which
includes the availability of the application); the application
is responsible for application state info.

> Am wondering if SCCP and MTP3 carry any state that need to be
> checkpointed to a backup node. If so, what does the state
> contain.

Yes.  For MTP that state contains the status of links, link
sets, routes, route sets, and signalling point state.  For SCCP
it contains the status of subsystems, replicated subsystems,
global titles (and connection state for connection-oriented
services).  SCCP is much like UDP/TCP.

> 2) How are the MTP3 routes propogated thru the network ? In IP
> world there are dynamic routing protocols like RIP, OSPF. Are
> there any corresponding protocols in SS7 ?

Yes.  MTP and SCCP have their own peer-to-peer protocol for
updating network configuration information.  They are built into
the protocol and are not so much a separate piece as you see in
the IP domain.

> 
> Appreciate your help,
> 
> Thanks,
> - sanjay
> 
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-- 
Brian F. G. Bidulock    ¦ The reasonable man adapts himself to the ¦
bidulock@openss7.org    ¦ world; the unreasonable one persists in  ¦
http://www.openss7.org/ ¦ trying  to adapt the  world  to himself. ¦
                        ¦ Therefore  all  progress  depends on the ¦
                        ¦ unreasonable man. -- George Bernard Shaw ¦