Re: Clarification in NSSA
Vivek Dubey <vivek_ospf@REDIFFMAIL.COM> Sat, 28 June 2003 08:15 UTC
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Date: Sat, 28 Jun 2003 08:14:04 -0000
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From: Vivek Dubey <vivek_ospf@REDIFFMAIL.COM>
Subject: Re: Clarification in NSSA
To: OSPF@PEACH.EASE.LSOFT.COM
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Hi, The point krishna is trying to make: 1) R3 goes down 2) R2 gets elected as translator 3) But R2 while translating Type 7 to Type 5 sees functionally equv Type 5 previously translated by R3 (before being stopped). Note R3 router id is higher. So R2 doesn't originate Translated Type 5. 4) So both R2 and R1 hold Type 5 generated by R3 before it went down (no flushing was done by R3 before going down). 5) Consequently R1 will loose routes to those Type 7 networks (calculated using Translated Type 5 by R3). 6) But R2 will hold routes as it is directly connected to NSSA area and can use Type 7 for getting to those networks. This can happen in real networks. Probably Pat can clarify how to handle such scenarios. thanks, vivek On Fri, 27 Jun 2003 Jeyanath Minto J - CTD, Chennai. wrote : >hi Krishna, > R2 maintain a List of this area's Nssa border Routers and >ASBR. >Translator is Elected from this List. > so , when u stopped the R3 , R2 removes the R3 from the >List. And R2 >will elect itself as a Translator ( because R3 is unreachable ) >and >translate type 7 to Type 5. > > > >Cheers >Minto Mascarenhas >********************************************************************** >* Internet IS for everyone - but it won't be unless WE make it >so * >********************************************************************** > >-----Original Message----- > From: Krishna Rao [mailto:ospf_query@REDIFFMAIL.COM] >Sent: Friday, June 27, 2003 11:50 AM >To: OSPF@PEACH.EASE.LSOFT.COM >Subject: Clarification in NSSA > > >Hi > >I am basically testing RFC 3101 NSSA implementation. I find >that >routes are missing in the Router (not in NSSA area) but is >conected to the Router in NSSA area through backbone area. > > >Topology Used in Testing >======================== > |-------------------------------| > | | > | | > | | >R1-------------R2---------------R3 > | | > | | > | | > --------------------------- NSSA area 0.0.0.1 > | > | > | > R4 > | area 0.0.0.1 > |Import External Routes. > | > >There are 2 areas in this Topology - >NSSA area 0.0.0.1 (R2, R3 and R4) >Remaining all the networks are in backbone area. > >R1 is connected to R2 and R3 through backbone area. R2 and R3 >are >connected through backbone area. > >RouterID of R1 10.0.0.1 >RouterID of R2 20.0.0.1 >RouterID of R3 30.0.0.1 > >R3 is elected as Translator. Import external routes at R4. R1 >holds the external routes. > >Now, stop the router R3. R2 takes over as Translator. > >BUT, now R1 doesnot hold the external routes. > >I expect the R1 to hold the external routes. But as per RFC >3101 >since R2 holds LSA generated by R3 which is of higher RouterID, >R2 >doesnot generate Type 5 LSAs. Is it correct. If this is the >case, >then R1 would never hold the external routes. > >Your response on this would be highly appreciated. > >Thanks & Regards >Krishna > > > > > >___________________________________________________ >Click below to experience Sooraj Barjatya's latest offering >'Main Prem Ki Diwani Hoon' starring Hrithik Roshan, >Abhishek Bachchan & Kareena Kapoor http://www.mpkdh.com ___________________________________________________ Click below to experience Sooraj Barjatya's latest offering 'Main Prem Ki Diwani Hoon' starring Hrithik Roshan, Abhishek Bachchan & Kareena Kapoor http://www.mpkdh.com
- Clarification in NSSA Krishna Rao
- Re: Clarification in NSSA Jeyanath Minto J - CTD, Chennai.
- Re: Clarification in NSSA Vivek Dubey
- Re: Clarification in NSSA Jeyanath Minto J - CTD, Chennai.
- Re: Clarification in NSSA Vivek Dubey
- Re: Clarification in NSSA Jeyanath Minto J - CTD, Chennai.
- Clarification in NSSA Vivek Dubey
- Re: Clarification in NSSA Vivek Dubey
- Re: Clarification in NSSA Pat Murphy - (650)329-4044