From: GAURAV MADAN (gauravmadan1177@gmail.com)
Date: Tue Dec 30 2008 - 11:42:45 ARST
Hi Nitro
One thing to remmeber ( may be keep this as best practice ) ..... one of the
feature of P2MP is the per neighbor cost .
i.e
R1
|
=======================
| |
R2 R3
If this is a regualr broadcast media and u try to apply neighbir cost
command ; you will get error stating that u r on worng ospf network tyoe .
Use ospf P2MP.
Regarding ur concern of autocost reference b/w ; this is a ospf proc CLI
....
so this will hold true / this will affect complete ospf proc .. our req is
to affect one of the host and not the other .
Think of this as ( in above ex) R2 uses Eth0 interface and R3 uses Gig
interface .. how will u affect the decision process correctly by configuring
R1 ,
HTH
Gaurav Madan
On Tue, Dec 30, 2008 at 5:13 PM, Nitro Drops <nitrodrops@hotmail.com> wrote:
> Setup :
>
> R3 E0/1 (173.1.23.3/24) > F0/3 SW2 (vlan23)
> R4 F0/1 (173.1.23.4/24) > F0/4 SW2 (vlan23)
> SW2 vlan 23 173.1.23.8/24
>
> OSPF Adjacency between SW2, R3 & R4.
>
> Task - SW2 takes into consideration of R3 E0/1 (Ethernet) and R4 F0/1
> (FastEthernet) interfaces when computing OSPF.
>
> Solution
> - change ospf type to P2MP NB on all 3 devices
> - Under SW2 OSPF process
> neighbor 173.1.23.3 cost 10 < Ethernet
> neighbor 173.1.23.4 cost 1 < FastEthernet
>
> Qns1.) To derive the cost value. Normally i configured the b/w under the
> interface, followed by 'sh ip ospf int brief' to capture the cost value for
> the configured b/w. Is there any other way to derive the cost value? And
> can i
> leave the b/w statement on R3 E0/1 and R4 F0/1 interfaces?
>
> Qns2.) Is there a possibility to use "auto-cost reference-bandwidth " for
> this
> task?
>
> Qns3.) Last but not leave, what are the differences between (i) 'neighbor
> cost' in P2MP NB mode and (ii) auto-cost reference-bandwidth under OSPF
> process?
>
> Cheers
> Nit
>
>
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