Can a loopback interface be added to both OSPF and IS-IS?

Created: Dec 27, 2019 02:50:07Latest reply: Dec 27, 2019 02:53:41 68 1 0 0
  Rewarded HiCoins: 0 (problem resolved)

Hi all,

Brief topology: R1---(ISIS)---R2---(OSPF)---R3

As shown in the preceding command output, IS-IS runs between R1 and R2, and OSPF runs between R2 and R3. Therefore, the loopback interface on R2 can be added to both OSPF and IS-IS. After the preceding configurations, R1 and R3 can learn the loopback address of R2 through the protocols.

I do not want R1 and R3 to communicate with each other. Is there any problem with the configuration?

Thank you.

  • x
  • convention:

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Popeye_Wang
Admin Created Dec 27, 2019 02:53:41 Helpful(0) Helpful(0)

Hi Sprout,

The configuration is not affected. OSPF and IS-IS are still two separate IGP areas. R1 can communicate with R3 only after routes are imported between the two areas on R2.

  • x
  • convention:

All Answers
Popeye_Wang
Popeye_Wang Admin Created Dec 27, 2019 02:53:41 Helpful(0) Helpful(0)

Hi Sprout,

The configuration is not affected. OSPF and IS-IS are still two separate IGP areas. R1 can communicate with R3 only after routes are imported between the two areas on R2.

  • x
  • convention:

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