ISIS NET

Created: Sep 9, 2019 10:14:27Latest reply: Sep 11, 2019 07:55:28 99 3 0 0
  Rewarded Hi-coins: 0 (problem resolved)

Hi,if we not configure NET in ISIS then what will be the issues? & whats the advantage of NET.??and what the alternative of NET in OSPF ? except area that mentioned in NET aslo.

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Popeye_Wang
Admin Created Sep 9, 2019 10:37:09 Helpful(0) Helpful(0)

A NET is actually a special NSAP (Network Service Access Point), which is equivalent to the IP address in TCP/IP.
The system ID in NET is equivalent to router ID in OSPF.
OSPF does not have a concept similar to the area in NET, I think its more similar to the AS number in BGP.
And the NSEL is equivalent to the Protocol field in the IPv4 header which describes the upper-layer protocol number.

  • x
  • convention:

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Popeye_Wang
Popeye_Wang Admin Created Sep 9, 2019 10:37:09 Helpful(0) Helpful(0)

A NET is actually a special NSAP (Network Service Access Point), which is equivalent to the IP address in TCP/IP.
The system ID in NET is equivalent to router ID in OSPF.
OSPF does not have a concept similar to the area in NET, I think its more similar to the AS number in BGP.
And the NSEL is equivalent to the Protocol field in the IPv4 header which describes the upper-layer protocol number.

  • x
  • convention:

LSA
LSA Created Sep 9, 2019 11:26:08 Helpful(0) Helpful(0)

Posted by Popeye_Wang at 2019-09-09 10:37 A NET is actually a special NSAP (Network Service Access Point), which is equivalent to the IP addre ...
Thanks for reply...but when we run display router id command then show different Router id then NET system ID that we given in NET...means Router already taken router ID without NET...then why use...system ID??
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  • convention:

chenhui
chenhui Admin Created Sep 11, 2019 07:55:28 Helpful(0) Helpful(0)

Posted by LSA at 2019-09-09 11:26 Thanks for reply...but when we run display router id command then show different Router id then NE ...
first of all, it should be point out that ISIS runs on another totally different address system from IP address. When the SEL equals 0, it indicates the ISIS is running on the IP network. In this scenario, system ID is used to unique identifing the routers. Tough it overlaps with the router ID, as I said before, ISIS didn't recognize the IP address, so the router ID is meaningless to the ISIS.
  • x
  • convention:

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