350-501 · Question #399
Refer to the exhibit. Routers R1 and R2 are connected via a serial link and use the IS-IS routing protocol for route exchange. After a configuration change on R2, IS-IS connectivity is interrupted…
The correct answer is B. Change the MTU to 1500 bytes on R2 D. Disable padding for hello packets under the serial interface on R2. system-is-is/119399-technote-isis-00.html The MTU on the serial interfaces for the routers R1 and R2 are the default 1,500 bytes. The IS-IS adjacency fails because the IS-IS Hello packets are 1,499 bytes in size. The MPLS network only allows 1,500-byte packets, minus eight…
Question
Refer to the exhibit. Routers R1 and R2 are connected via a serial link and use the IS-IS routing protocol for route exchange. After a configuration change on R2, IS-IS connectivity is interrupted. A network engineer confirmed that the interfaces are in the UP state and connectivity exists between the two routers. Which two actions must the engineer perform to resolve the problem? (Choose two.)
Exhibit
Options
- AChange the hello interface timer to 10 seconds on R1
- BChange the MTU to 1500 bytes on R2
- CChange R2 to an IS-IS Level 1 router
- DDisable padding for hello packets under the serial interface on R2
- EEnable hello packet padding globally on R1
How the community answered
(46 responses)- A9% (4)
- B83% (38)
- C7% (3)
- E2% (1)
Explanation
system-is-is/119399-technote-isis-00.html The MTU on the serial interfaces for the routers R1 and R2 are the default 1,500 bytes. The IS-IS adjacency fails because the IS-IS Hello packets are 1,499 bytes in size. The MPLS network only allows 1,500-byte packets, minus eight bytes (two MPLS labels for the MPLS service), which equals 1,492 bytes (the packet size that is allowed to pass through). For transport of L2 over MPLS, the size of the L2 header must be subtracted from the 1,492 bytes that result as
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