From: Chuck Larrieu (chuck@xxxxxxxxxxxxx)
Date: Wed May 23 2001 - 17:01:22 GMT-3
Got any idea when this was added? And what it really refers to? All of the
documents I have read say that 4 is the max.
If you check the doc CD, the maximum-paths command appears under the
protocol independent command reference.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_r
/iprprt2/1rdindep.htm#xtocid2797020
( watch the wrap )
and not under the OSPF command reference
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_r
/iprprt2/1rdospf.htm
I don' have the means of testing, but I believe that you will not get more
than four under ospf and can get six only under eigrp or static routing.
Anyone tested this?
Chuck
-----Original Message-----
From: Pickell, Aaryn [mailto:Aaryn.Pickell@getronics.com]
Sent: Wednesday, May 23, 2001 12:27 PM
To: 'Chuck Larrieu'; Shane Miles; ccielab@groupstudy.com
Subject: RE: OSPF unequal cost load balancing
I think you can increase the number of equal cost paths it will hold.
Border(config-router)#maximum-paths ?
<1-6> Number of paths
Aaryn Pickell - CCNP ATM, CCDP, MCSE
Senior Engineer - Routing Protocols
Getronics Inc.
Direct: 713-394-1609
Email:aaryn.pickell@getronics.com
This e-mail message and any attachments are confidential and may be
privileged. If you are not the intended recipient, please notify me
immediately by replying to this message and please destroy all copies of
this message and attachments. Thank you.
> -----Original Message-----
> From: Chuck Larrieu [mailto:chuck@cl.cncdsl.com]
> Sent: Wednesday, May 23, 2001 2:06 PM
> To: Shane Miles; ccielab@groupstudy.com
> Subject: RE: OSPF unequal cost load balancing
>
>
> Follow up, quoted from RFC 2328:
>
> "The OSPF protocol maintains multiple equal-cost routes to
> all destinations.
> This can be seen in the steps used above to calculate the
> routing table, and
> in the definition of the routing table structure.
>
> " Each one of the multiple routes will be of the same type
> (intra-area,
> inter-area, type 1 external or type 2 external), cost, and
> will have the
> same associated area. However, each route may specify a
> separate next hop
> and Advertising router.
>
> "There is no requirement that a router running OSPF keep track of all
> possible equal-cost routes to a destination. An
> implementation may choose to
> keep only a fixed number of routes to any given destination.
> This does not
> affect any of the algorithms presented in this specification. "
>
> So Cisco appears to have decided that 4 is the magic number.
> There may be
> practical reasons for this, but according to the RFC, there
> could be more or
> fewer equal cost paths supported.
>
> But no, OSPF does not support unequal cost paths, which would
> defeat the
> purpose of the algorithm in the first place.
>
> HTH
>
> Chuck
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of
> Shane Miles
> Sent: Wednesday, May 23, 2001 11:25 AM
> To: 'ccielab@groupstudy.com'
> Subject: OSPF unequal cost load balancing
>
> My understanding is that when using OSPF you can have up to 4
> equal-cost paths performing load balancing. Is it at all
> possible to do
> unequal cost load balancing with OSPF as is possible with EIGRP?
>
> --
> Shane P. Miles
> **Please read:http://www.groupstudy.com/list/posting.html
> **Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
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