I still can not leave that question alone. It is a good question. Why is
IS-IS for large networks? The why is the key.
http://www.juniper.net/techcenter/techpapers/200003-02.html
.Design for Scalability
Scalability is concerned with the ability of the implementation to grow with
the ever-expanding network environment. There are a number of factors that
play a key role in determining the scalability of a routing protocol
implementation:
' Maximum number of interfaces supported
' Speed of a routing table search
' Maximum number of routes that can be stored in the routing table
' Maximum number of OSPF or IS-IS adjacencies or BGP peers that can be
supported on each router
' Maximum number of OSPF LSAs or IS-IS LSPs that can be stored in the
router's link-state database
' Ability of the policy control language to permit administrators to easily
and efficiently control the import, export, and modification of an enormous
amount of routing information
http://www.nortelnetworks.com/index.html
Type IS-IS and they have a great PDF on the protocol.
http://www-search.cisco.com/pcgi-bin/search/public.pl?q=OSPF+vs+IS-IS&num=10
&searchselector=0 My search on Cisco
I noticed Cisco will compare OSPF with RIP or EIGRP but not IS-IS I wonder
why??
I can not find anything on IS-IS perhaps I am not using the correct string
when looking on Cisco.. I notice with Nortel and Juniper I had no issues
finding something on it.
Curtis
----- Original Message -----
From: "Curtis Rose"
To:
Sent: Sunday, May 20, 2001 11:20 PM
Subject: Re: How is IS-IS more scalable than OSPF? [7:5207]
> Good Question!
>
> I have read that IS-IS can accept more nodes than OSPF. Yet, I find that
> Juniper is pushing IS-IS and the US Govt has some networks on IS-IS.
Black
> in the IP Routing Protocols basically states it is an IP Protocol but is
not
> used in the internet or much elsewhere for that matter.
>
> In Priscilla's Top-Down Network Design book on page 236 shows the
> scalability of OSPF to about 50 routers per area and about 100 areas and
> the IS-IS 1,000s of routers.
>
> In Sam Halabi's book Internet Routing Architectures on page 100
.....Today,
> both IS-IS and OSPF are widely deployed in ISP Networks. The maturity and
> stability of IS-IS has resulted in it remaining deployed in large
networks,
> as well as its being the IGP of choice for some recently deployed
networks.
>
> In Catherine Paquet and Diane Teare's book Building Scalable Cisco
Networks
> on page 23 is a Table comparing OSPF, IS-IS and EIGRP. Basically IS-IS
wins
> out for Scalability.
>
> Sorry I can not be of more help.
>
> Curtis
>
> Curtis Rose
> ----- Original Message -----
> From: "NRF"
> To:
> Sent: Sunday, May 20, 2001 10:24 PM
> Subject: How is IS-IS more scalable than OSPF? [7:5207]
>
>
> > Hello
> >
> > Several people have asserted that IS-IS (for IP) has demonstrated more
> > scalability than OSPF. What accounts for this? I have heard that it
has
> > to do with IS-IS being able to take advantage of Partial-route Updates
> when
> > IP information changes, as opposed to running Dijkstra all the time, is
> that
> > the only factor, or are there other reasons?
> >
> > Thanx
> > FAQ, list archives, and subscription info:
> http://www.groupstudy.com/list/cisco.html
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> FAQ, list archives, and subscription info:
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