* Step 1: Check the error messages in the log.
The log messages indicate:
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Dec 22 19:22:29 router rpd[7394]: bgp_process_open:4185: NOTIFICATION sent to 192.168.1.4 (Internal AS 65000): code 2 (Open Message Error) subcode 2 (bad peer AS number), Reason: peer 192.168.1.4 (Internal AS 65000) claims 65100, 65000 configured Dec 22 19:22:33 router rpd[7394]: bgp_pp_recv:4788: NOTIFICATION sent to 192.168.1.4+56714 (proto):
code 2 (Open Message Error) subcode 2 (bad peer AS number), Reason: no group for 192.168.1.4+56714 (proto) from AS 65100 found (peer as mismatch) in master
* Step 2: Interpret the messages.
* The first message indicates that a BGP NOTIFICATION was sent to 192.168.1.4 due to an "Open Message Error" with a "bad peer AS number" because peer 192.168.1.4 claims AS 65100, but
65000 is configured.
* The second message reiterates that the peer AS number 65100 does not match the configured AS
65000, causing a mismatch.
* Step 3: Understand the MD5 key error.
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Dec 22 19:23:29 router kernel: tcp_auth_ok: Packet from 192.168.1.5:64047 missing MD5 digest Dec 22 19:23:30 router kernel: tcp_auth_ok: Packet from 192.168.1.6:56201 missing MD5 digest
* These lines indicate that packets from 192.168.1.5 and 192.168.1.6 are missing the MD5 digest, suggesting a potential MD5 key misconfiguration.
* Step 4: Validate the answers.
* Option B: The 192.168.1.5 peer has a misconfigured MD5 key. This is correct because the logs show that packets from 192.168.1.5 are missing the MD5 digest.
* Option D: The 192.168.1.4 peer has a misconfigured autonomous system number. This is correct because the logs indicate that 192.168.1.4 claims AS 65100, while the router is configured for AS
65000.
References:
* Document on useful Juniper commands for troubleshooting BGP and understanding log messages.
* Commands for checking BGP logs: show log messages | match notification, show bgp summary, show configuration protocols bgp.