You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established.
In this scenario, what are two reasons for this problem? (Choose two.)
You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established.
In this scenario, what are two reasons for this problem? (Choose two.)
The IS-IS adjacencies might not be established if the MTU is not at least 1492 bytes because IS-IS relies on a minimum MTU size for proper operation. Additionally, the Io0 interface (Loopback 0) should be included as an IS-IS interface. Loopback interfaces are commonly used as the source for IS-IS routing updates, ensuring stable and reliable routing adjacency formation.
chatGPT: The two reasons for the IS-IS adjacencies not being established could be: A. MTU is not at least 1492 bytes. D. The Io0 interface is not included as an IS-IS interface. Explanation: A. IS-IS may have issues establishing adjacencies if the Maximum Transmission Unit (MTU) is not set correctly. It is recommended to set the MTU to at least 1492 bytes for IS-IS. D. The Loopback 0 (Io0) interface should typically be included as an IS-IS interface. Loopback interfaces are often used as the source for IS-IS routing updates, and omitting them could prevent adjacencies from forming. So, options A and D are the correct reasons for the problem.
A,D are correct
AD are correct - ac89l explained it well. Also, B and C would be incorrect because: IS-IS adjacencies don't rely on IP protocol, you don't even need an IP configuration on links used for forming an adjancency. Also, the one of the points of Level-2 routers is to form an adjacency between different areas.