Re: [Lsr] some doubt about RFC 5185 (Multi Area Adjacency)

[Acee Lindem (acee)]

Hi Meicong,

From: Lsr  on behalf of meicong 
Date: Thursday, September 24, 2020 at 2:23 AM
To: "lsr@ietf.org" 
Cc: Huzhibo , "Jiangyu (China)" 
Subject: [Lsr] some doubt about RFC 5185 (Multi Area Adjacency)



Hi ALL,
About rfc5185  OSPF Multi-Area Adjacency section 2.7 Advertising Multi-Area 
Adjacencies:

 Link ID = Remote's Router ID



I have the following questions:



1、I'm not sure whether “Neighbor's IP Address” means “local interface IP 
address” or “remote interface IP address”.

2、If it is remote interface IP address， why not use local interface IP address, 
 Any special considerations?



In looking at this again, I believe using the remote interface IP address is 
unnecessary since the interface area ID can be used to disambiguate the usage 
for multiple adjacencies.



Thanks,
Acee







Thanks,

In section 2.7，
Link Data = Neighbor's IP Address


2.7.  Advertising Multi-Area Adjacencies



   Multi-area adjacencies are announced as point-to-point links.  Once

   the router's multi-area adjacency reaches the FULL state, it will be

   added as a link type 1 to the Router Link State Advertisement (LSA)

   with:



  Link ID = Remote's Router ID



  Link Data = Neighbor's IP Address or IfIndex (if the underlying

  interface is unnumbered).


rfc5185  OSPF Multi-Area Adjacency

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[Lsr] some doubt about RFC 5185 (Multi Area Adjacency)

[meicong]

Hi ALL,
About rfc5185  OSPF Multi-Area Adjacency section 2.7 Advertising Multi-Area 
Adjacencies:

 Link ID = Remote's Router ID



I have the following questions:



1、   I'm not sure whether “Neighbor's IP Address” means “local interface IP 
address” or “remote interface IP address”.

2、If it is remote interface IP address， why not use local interface IP address, 
 Any special considerations?







Thanks,

In section 2.7，
Link Data = Neighbor's IP Address


2.7.  Advertising Multi-Area Adjacencies



   Multi-area adjacencies are announced as point-to-point links.  Once

   the router's multi-area adjacency reaches the FULL state, it will be

   added as a link type 1 to the Router Link State Advertisement (LSA)

   with:



  Link ID = Remote's Router ID



  Link Data = Neighbor's IP Address or IfIndex (if the underlying

  interface is unnumbered).


rfc5185  OSPF Multi-Area Adjacency

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[Lsr] some doubt about RFC 5185 (Multi Area Adjacency)

[meicong]

Hi ALL,
About rfc5185  OSPF Multi-Area Adjacency section 2.7 Advertising Multi-Area 
Adjacencies:

 Link ID = Remote's Router ID



I have the following questions:



1、   I'm not sure whether “Neighbor's IP Address” means “local interface IP 
address” or “remote interface IP address”.



I have test cisco’s new version, it is set Link Data as local interface IP 
address.



2、If it is remote interface IP address， why not use local interface IP address, 
 Any special considerations?







Thanks,
xxx

In section 2.7，
Link Data = Neighbor's IP Address


2.7.  Advertising Multi-Area Adjacencies



   Multi-area adjacencies are announced as point-to-point links.  Once

   the router's multi-area adjacency reaches the FULL state, it will be

   added as a link type 1 to the Router Link State Advertisement (LSA)

   with:



  Link ID = Remote's Router ID



  Link Data = Neighbor's IP Address or IfIndex (if the underlying

  interface is unnumbered).


rfc5185  OSPF Multi-Area Adjacency


Authors' Addresses

   Sina Mirtorabi
   Nuova Systems
   3 West Plumeria Drive
   San Jose, CA  95134
   USA

   EMail: s...@nuovasystems.com

   Peter Psenak
   Cisco Systems
   Apollo Business Center
   Mlynske nivy 43
   821 09 Bratislava
   Slovakia

   EMail: ppse...@cisco.com

   Acee Lindem (editor)
   Redback Networks
   102 Carric Bend Court
   Cary, NC  27519
   USA

   EMail: a...@redback.com

   Anand Oswal
   Redback Networks
   300 Holger Way
   San Jose, CA  95134
   USA

   EMail: aos...@redback.com


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