Hi Kui,
Yes - there could be an ABR for the transit area that takes a
"shortcut" across the transit area for a non-virtual link path. Other
routers in the backbone will not know about this path and may take
other paths. However, this is not a problem since there is no
possibility of a routing loop. Additionally, the situation can easily
be remedied by configuring a virtual link between the transit area
routers across the "shortcut" path.
Thanks,
Acee
On Apr 30, 2007, at 2:48 AM, 章魁 wrote:
Hi Acee,
I guess Jin is asking that a non-optimal path might be chosen when
other
routers in backbone area can't check the transit area's summary lsa to
update the intra-area route. This should be a drawback of virtual
link, I
think.
Kui
-----Original Message-----
From: Acee Lindem [mailto:[EMAIL PROTECTED]
Sent: Monday, April 30, 2007 4:11 AM
To: Anton Smirnov
Cc: OSPF List; Jin Wang
Subject: Re: [OSPF] Doubt for virtual link cost ?
Hi Anton, Jin,
I guess I don't really understand the point of controversy here. I
agree with Anton. Note that if there is not an active virtual link
then the non-backbone area is not a transit area.
Thanks,
Acee
On Apr 29, 2007, at 8:23 AM, Anton Smirnov wrote:
Jin,
right. In network design where such scenario is possible you
always
can create VL between this ABR and ABR providing best path via
transit
area. This will make the best path 'visible' to other routers in
backbone.
Anton
Jin Wang wrote:
Thanks for anton's response.
But if so,only the traffic going through this ABR(determined
before 16.3
calculating result) is forwarded by the new optimal path.For those
other
traffic not forwarded via this ABR(determined by 16.1 & 16.2) in the
backbone will not consider the new path(via ABR) even path is
shorter.right?
Best regards,
Wangjin
Accton Technology China Company Ltd.
Shanghai R&D Center
TEL:+86-021-64859922*6227
E-mail:[EMAIL PROTECTED]
Web Site:www.accton.com.cn
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