JN0-643 · Question #43
A colleague recently implemented MSTP in your Layer 2 network and is having trouble determining why it is not working properly. You are asked to review the outputs provided in the exhibit to…
The correct answer is C. The MSTP revision is configured incorrectly. See the full explanation below for the reasoning.
Question
A colleague recently implemented MSTP in your Layer 2 network and is having trouble determining why it is not working properly. You are asked to review the outputs provided in the exhibit to determine the cause. user@switch-1> show spanning-tree bridge STP bridge parameters Context ID : 0 Enabled protocol : MSTP STP bridge parameters for CIST ... STP bridge parameters for MSTI 1 MSTI regional root : 4097.b0:c6:9a:73:27:90 Hello time : 2 seconds Maximum age : 20 seconds Forward delay : 15 seconds Number of topology changes : 4 Time since last topology change : 42 seconds Topology change initiator : ge-0/0/10.0 Topology change last recvd. from : 00:19:e2:55:24:8c Local parameters Bridge ID : 4097.b0:c6:9a:73:27:90 Extended system ID : 0 Internal instance ID : 1 STP bridge parameters for MSTI 2 MSTI regional root : 8194.b0:c6:9a:73:27:90 Hello time : 2 seconds Maximum age : 20 seconds Forward delay : 15 seconds Number of topology changes : 4 Time since last topology change : 42 seconds Topology change initiator : ge-0/0/10.0 Topology change last recvd. from : 00:19:e2:55:24:8c Local parameters Bridge ID : 8194.b0:c6:9a:73:27:90 Extended system ID : 0 Internal instance ID : 2 user@switch-1> show spanning-tree mstp configuration MSTP information Context identifier : 0 Region name : my-mstp-config Revision : 1 Configuration digest : 0x91ee8012e6851d931adae71da4060690 MSTI Member VLANs 0 0,400-4094 1 1-199 2 200-399 user@switch-2> show spanning-tree bridge STP bridge parameters Context ID : 0 Enabled protocol : MSTP STP bridge parameters for CIST ... STP bridge parameters for MSTI 1 MSTI regional root : 8193.b0:c6:9a:73:39:90 Hello time : 2 seconds Maximum age : 20 seconds Forward delay : 15 seconds Number of topology changes : 3 Time since last topology change : 320 seconds Topology change initiator : ge-0/0/9.0 Topology change last recvd. from : b0:c6:9a:73:27:81 Local parameters Bridge ID : 8193.b0:c6:9a:73:39:90 Extended system ID : 0 Internal instance ID : 1 STP bridge parameters for MSTI 2 MSTI regional root : 4098.b0:c6:9a:73:39:90 Hello time : 2 seconds Maximum age : 20 seconds Forward delay : 15 seconds Number of topology changes : 3 Time since last topology change : 320 seconds Topology change initiator : ge-0/0/9.0 Topology change last recvd. from : 00:19:e2:55:24:8d Local parameters Bridge ID : 4098.b0:c6:9a:73:39:90 Extended system ID : 0 Internal instance ID : 2 user@switch-2> show spanning-tree mstp configuration MSTP information Context identifier : 0 Region name : my-mstp-config Revision : 10 Configuration digest : 0x91ee8012e6851d931adae71da4060690 MSTI Member VLANs 0 0,400-4094 1 1-199 2 200-399 Referring to the exhibit, what is causing the issue?
Options
- AThe region name is configured the same on both devices.
- BThe VLAN mapping is configured incorrectly.
- CThe MSTP revision is configured incorrectly.
- DThe bridge priority has not been configured correctly.
How the community answered
(27 responses)- A7% (2)
- B11% (3)
- C78% (21)
- D4% (1)
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