From: Ciscolab (ciscolab@vip.sina.com)
Date: Sun May 25 2003 - 05:12:33 GMT-3
Brian Dennis,
Thank you very much.
When the ethernet is up, (Area 0 is ok), and ISDN is down, the area 1 is splitted, is it normal situation?
======= 2003-05-24 23:20:00 DzTZ@4PEVPP45@#:=======
>It's not good practice but you can have as many area 1's as you want.
>
><RFC2328>
>3.7. Partitions of areas
>
> OSPF does not actively attempt to repair area partitions. When
> an area becomes partitioned, each component simply becomes a
> separate area. The backbone then performs routing between the
> new areas. Some destinations reachable via intra-area routing
> before the partition will now require inter-area routing.
>
> However, in order to maintain full routing after the partition,
> an address range must not be split across multiple components of
> the area partition. Also, the backbone itself must not
> partition. If it does, parts of the Autonomous System will
> become unreachable. Backbone partitions can be repaired by
> configuring virtual links (see Section 15).
></RFC2328>
>
>In your case you need to make sure that you don't end up with two area
>0's if the Ethernet's become "disconnected". If one Ethernet actually
>goes "down" and the BRI calls, then you are okay. Also if you are using
>a virtual link make sure you take into consideration the possibility of
>one of the Ethernet interfaces going down. The reason being is that the
>router would cease to be an area 0 router anymore.
>
>Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
>
>-----Original Message-----
>From: Ciscolab [mailto:ciscolab@vip.sina.com]
>Sent: Saturday, May 24, 2003 10:01 PM
>To: ccielab@groupstudy.com; brian@labforge.com
>Subject: discontinuous OSPF Area
>Importance: High
>
>ccielabHello, Group,
>
>I have the following topology, R1 and R2 is in ospf area 0 and with ISDN
>backup area 1, when ISDN interface of both is do
>wn, the area 1 is splitted, is it working well ? any comments, thanks
>for your input.
>
>
>R1(e0)<-----area 0----->(e0)R2
> \ /
> (Bri0)<---area 1--->(Bri0)
>
>$B!!!!!!!!!!!!!!!!(BCiscolab
>$B!!!!!!!!!!!!!!!!(Bciscolab@vip.sina.com
>$B!!!!!!!!!!!!!!!!!!!!(B2003-05-25
= = = = = = = = = = = = = = = = = = = =
!!!!!!!!!!!!!!!!VB
@q#!
!!!!!!!!!!!!!!!!Ciscolab
!!!!!!!!!!!!!!!!ciscolab@vip.sina.com
!!!!!!!!!!!!!!!!!!!!2003-05-25
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