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Area authentication

Area authentication

Created: May 27, 2020 15:03:36Latest reply: Jul 12, 2021 18:20:00 365 4 1 0 0
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Hi,

When I configured ISIS, device A and device B established a neighbor relationship. At this time, I configured area authentication on the A device, but I found that the neighbor status of the two devices was not disconnected. Why can neighbor relationships be set up even when area authentication is configured only on one side? Thanks.

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Popeye_Wang
Admin Created May 27, 2020 15:06:45

Hi,

To establish a neighbor relationship, only Hello packets need to be exchanged. In area authentication and routing domain authentication, only the received routing information packets (LSP and SNP) are authenticated according to the preset mode and password, and authentication information is added to the sent packets. This does not affect the establishment of neighbor relationships. In your case, if IS-IS is enabled on the interface loopback0  of A and B, because of the authentication, you can find that A can still ping the loopback0 of B, but B cannot ping the loopback0 of A.

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Popeye_Wang
Popeye_Wang Admin Created May 27, 2020 15:06:45

Hi,

To establish a neighbor relationship, only Hello packets need to be exchanged. In area authentication and routing domain authentication, only the received routing information packets (LSP and SNP) are authenticated according to the preset mode and password, and authentication information is added to the sent packets. This does not affect the establishment of neighbor relationships. In your case, if IS-IS is enabled on the interface loopback0  of A and B, because of the authentication, you can find that A can still ping the loopback0 of B, but B cannot ping the loopback0 of A.

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  • convention：
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ulrichwandja
ulrichwandja Created Jul 7, 2021 17:48:48

Thanks
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Unicef
Unicef MVE Created Jul 12, 2021 13:16:45

Good answer
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andersoncf1
andersoncf1 MVE Author Created Jul 12, 2021 18:20:00

Good answer from Popeye!!! Useful
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