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Question 6/85
What can be determined from the following figure?
<R1> display ipv6 routing-table protocol isis
Public Routing Table : ISIS
Summary Count: 6
ISIS Routing Table's Status : < Active >
Summary Count: 6
Destination : 3000:FDEA::4
NextHop : FE80::2E0:FCFF:FE98:2577
Cost : 20
Interface : GigabitEthernet0/0/1
PrefixLength : 128
Preference : 15
Protocol : ISIS-L2
Flags : D
<R1> display ipv6 routing-table protocol isis
Public Routing Table : ISIS
Summary Count: 6
ISIS Routing Table's Status : < Active >
Summary Count: 6
Destination : 3000:FDEA::4
NextHop : FE80::2E0:FCFF:FE98:2577
Cost : 20
Interface : GigabitEthernet0/0/1
PrefixLength : 128
Preference : 15
Protocol : ISIS-L2
Flags : D
Correct Answer: A,C,D
* Analyzing the Routing Table Output:
* The command display ipv6 routing-table protocol isis shows all IPv6 routes learned via IS-IS.
* The output shows "Summary Count: 6", meaning R1 has six IS-IS IPv6 routes.
* Explanation of Correct Answers:# A. R1 has six IS-IS IPv6 routes.
* The "Summary Count: 6" confirms that six IS-IS IPv6 routes exist in R1's routing table.
# C. IS-IS IPv6 must have been enabled on GigabitEthernet0/0/1 of R1.
* The interface GigabitEthernet0/0/1 is listed as the next-hop, meaning IS-IS IPv6 must be enabled on that interface.
# D. R1 is not a Level-1 device.
* The protocol is listed as "ISIS-L2", indicating that R1 is an IS-IS Level-2 (backbone) router, not a Level-1 router.
* Incorrect Answer Explanation:# B. R1 does not have IS-IS IPv6 routes.
* Wrong! The output clearly shows six IS-IS IPv6 routes, proving this statement false.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei IPv6 Routing Protocols Guide - IS-IS for IPv6
* HCIE-Datacom Routing & Switching Training - IS-IS L1 & L2 Operations
* Huawei IS-IS Configuration Guide - IPv6 Route Management
* The command display ipv6 routing-table protocol isis shows all IPv6 routes learned via IS-IS.
* The output shows "Summary Count: 6", meaning R1 has six IS-IS IPv6 routes.
* Explanation of Correct Answers:# A. R1 has six IS-IS IPv6 routes.
* The "Summary Count: 6" confirms that six IS-IS IPv6 routes exist in R1's routing table.
# C. IS-IS IPv6 must have been enabled on GigabitEthernet0/0/1 of R1.
* The interface GigabitEthernet0/0/1 is listed as the next-hop, meaning IS-IS IPv6 must be enabled on that interface.
# D. R1 is not a Level-1 device.
* The protocol is listed as "ISIS-L2", indicating that R1 is an IS-IS Level-2 (backbone) router, not a Level-1 router.
* Incorrect Answer Explanation:# B. R1 does not have IS-IS IPv6 routes.
* Wrong! The output clearly shows six IS-IS IPv6 routes, proving this statement false.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei IPv6 Routing Protocols Guide - IS-IS for IPv6
* HCIE-Datacom Routing & Switching Training - IS-IS L1 & L2 Operations
* Huawei IS-IS Configuration Guide - IPv6 Route Management
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