神马文学网Simple OSPF limitation question | Quagga | Us...
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Simple OSPF limitation question Remove Highlighting
I searched but couldn't find the answer... questions from a customer
Is there a limit to the number of OSPF neighbors that quagga can have?
Something like 255? 65535?
Is there a limit on the number of areas that quagga can deal with? 255? (I
assume that this means in the LSAs or something)
Thanks,
Alex
------======<<<< ATTN: >>>>======------
Please note that my work email address has changed to:
ibm.alexf[at]us.ibm.com
Please update your contact lists.
lsorense at csclub
Jun 20, 2008, 11:10 AM
Post #2 of 4 (242 views)
Permalink
Re: Simple OSPF limitation question Remove Highlighting [In reply to]
On Fri, Jun 20, 2008 at 02:00:41PM -0400, Alex Filacchione wrote:
> I searched but couldn't find the answer... questions from a customer
>
> Is there a limit to the number of OSPF neighbors that quagga can have?
> Something like 255? 65535?
>
> Is there a limit on the number of areas that quagga can deal with? 255? (I
> assume that this means in the LSAs or something)
Well given the area id can be specified in IPv4 notation, I suspect you
can have 4 billion areas. :) No idea if that is true though.
--
Len Sorensen
_______________________________________________
Quagga-users mailing list
Quagga-users[at]lists.quagga.net
http://lists.quagga.net/mailman/listinfo/quagga-users
paul at clubi
Jun 20, 2008, 3:55 PM
Post #3 of 4 (235 views)
Permalink
Re: Simple OSPF limitation question Remove Highlighting [In reply to]
On Fri, 20 Jun 2008, Alex Filacchione wrote:
> Is there a limit to the number of OSPF neighbors that quagga can have?
> Something like 255? 65535?
There are limits in the protocol:
a1) The number of neighbours that can be listed in an OSPF hello
packet (IP max size - OSPF Hello fixed overhead - OSPF fixed
header) / sizeof (struct in_addr). So that's around 16373
neighbours.
a2) The number of attached routers that can be described in a
network-LSA. it's pretty much the same as the previous, about
16372.
These are the upper bounds for # of neighbours on any single
multi-access IP interface.
b) The number of links a router LSA can describe. The limit here is
around 8183.
This is the limit on the total number of adjacencies (not
neighbours), in any given area - it can come into play if most links
are PtP.
> Is there a limit on the number of areas that quagga can deal with?
> 255? (I assume that this means in the LSAs or something)
There may be implementations that limit themselves to 255 neighbours
on an interface. AFAIK, we don't have such a limitation in Quagga.
However, it's not common to have that many neighbours, and its
possible there may be performance issues.
regards,
--
Paul Jakma paul[at]clubi.ie paul[at]jakma.org Key ID: 64A2FF6A
Fortune:
The opposite of a correct statement is a false statement. But the opposite
of a profound truth may well be another profound truth.
-- Niels Bohr
I searched but couldn't find the answer... questions from a customer
Is there a limit to the number of OSPF neighbors that quagga can have?
Something like 255? 65535?
Is there a limit on the number of areas that quagga can deal with? 255? (I
assume that this means in the LSAs or something)
Thanks,
Alex
------======<<<< ATTN: >>>>======------
Please note that my work email address has changed to:
ibm.alexf[at]us.ibm.com
Please update your contact lists.
lsorense at csclub
Jun 20, 2008, 11:10 AM
Post #2 of 4 (242 views)
Permalink
Re: Simple OSPF limitation question Remove Highlighting [In reply to]
On Fri, Jun 20, 2008 at 02:00:41PM -0400, Alex Filacchione wrote:
> I searched but couldn't find the answer... questions from a customer
>
> Is there a limit to the number of OSPF neighbors that quagga can have?
> Something like 255? 65535?
>
> Is there a limit on the number of areas that quagga can deal with? 255? (I
> assume that this means in the LSAs or something)
Well given the area id can be specified in IPv4 notation, I suspect you
can have 4 billion areas. :) No idea if that is true though.
--
Len Sorensen
_______________________________________________
Quagga-users mailing list
Quagga-users[at]lists.quagga.net
http://lists.quagga.net/mailman/listinfo/quagga-users
paul at clubi
Jun 20, 2008, 3:55 PM
Post #3 of 4 (235 views)
Permalink
Re: Simple OSPF limitation question Remove Highlighting [In reply to]
On Fri, 20 Jun 2008, Alex Filacchione wrote:
> Is there a limit to the number of OSPF neighbors that quagga can have?
> Something like 255? 65535?
There are limits in the protocol:
a1) The number of neighbours that can be listed in an OSPF hello
packet (IP max size - OSPF Hello fixed overhead - OSPF fixed
header) / sizeof (struct in_addr). So that's around 16373
neighbours.
a2) The number of attached routers that can be described in a
network-LSA. it's pretty much the same as the previous, about
16372.
These are the upper bounds for # of neighbours on any single
multi-access IP interface.
b) The number of links a router LSA can describe. The limit here is
around 8183.
This is the limit on the total number of adjacencies (not
neighbours), in any given area - it can come into play if most links
are PtP.
> Is there a limit on the number of areas that quagga can deal with?
> 255? (I assume that this means in the LSAs or something)
There may be implementations that limit themselves to 255 neighbours
on an interface. AFAIK, we don't have such a limitation in Quagga.
However, it's not common to have that many neighbours, and its
possible there may be performance issues.
regards,
--
Paul Jakma paul[at]clubi.ie paul[at]jakma.org Key ID: 64A2FF6A
Fortune:
The opposite of a correct statement is a false statement. But the opposite
of a profound truth may well be another profound truth.
-- Niels Bohr
Simple OSPF limitation question | Quagga | Us...
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