Refer to the exhibit. A bank ATM site has difficulty connecting with the bank server. A network engineer troubleshoots the issue and finds that R4 has no active route to the bank ATM site. Which action resolves the issue?
The LAN on R1 goes unreachable. => R1 starts querying for a path for prefix 10.20.10.0/24. (R1 is active for this prefix.)
After this, the routers R2 and R3 also go active and query.
"show ip eigrp topology active" -> Look for the small r in the command output.
This means that the router awaits a reply to a query for that prefix from that neighbor.
The R3 also goes active and awaits a reply from R4.
As shown, the router R4 does not go active for the prefix, because it did not recieve any queries. So, there must be an issue with the link between R3 and R4.
For same reason, R3 does not receive an SIA reply from R4, so the "s" appears for that neighbor under "show ip eigrp topology active".
rs = r - reply Status, s - sia Status
sent query and waiting for reply + did not recieve reply in SIA time
https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2019/pdf/BRKRST-2331.pdf
There are no active routes on other end (R4)
https://community.cisco.com/t5/routing/eigrp-stuck-in-active-routes/td-p/478346
if EIGRP has had a route in its table (some prefix that it can route to)
and if EIGRP loses that prefix from the table then EIGRP should put that prefix into "active state".
If a neighbor does not respond within a certain limit of time the EIGRP router assumes that it may have lost sync with the router
and tears down the neighbor relationship and starts over again from the beginning.
R1 waiting for reply about prefix 10.20.10.0/24 from neighbor 10.10.10.2
IP-EIGRP Topology Table for AS(1)/ID(10.20.10.1)
via 10.10.10.2, r, Ethernet1/
"Look for the small r in the command output. This means that the router awaits a reply to a query for that prefix from that neighbor."
https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/118974-technote-eigrp-00.html
you must discover the location where one or more routers sends queries and does not receive replies, while the downstream router is not in this state.
For example, the router could send queries and they are acknowledged, but the reply from the downstream router is not received.
the router R4 did not go active for the prefix, so the problem must be between routers R3 and R4.
After some time, we see that R3 kills the neighborship to R4 and declares an SIA state:
The router R3 also sends SIA queries to R4, but it does not receive an SIA reply from R4.
Once the router sends an SIA query but does not receive an SIA reply, the s appears for that neighbor
via 10.10.30.2 (infinity/infinity), rs, q., Ethernet1/0, serno 19, anchored
This line in the diagram indicates that a query has been sent out R3 for the network 10.10.30.2 and there is no response from R4(possibly SIA?). I would troubleshoot the link/peering from R3 to R4
Answer is D
B & C are false, just because no reason to work on that route because R1 is already missing the Bank ATM network
If you advertise a new network (10.10.30.0/24), it won't change anything about the connectivity issue
From R1 output, R1 lost the 10.20.10.0/24 and is searching for a feasible successor
At least the Query reached R3 as it says the Query is comming from the successor origin
In output of R3, 'via 10.10.30.2', "rs" means retry & SIA => this means didn't get a repy within the 3 minutes timer of the SIA (stuck-in-active)
Last point, the fact that R4 gives no output, just means not execting to search anymore the a route or still not notified by the query from R3
So, R3 is pending on retry and is in SIA state, because no answer from R4, then R4 has no route in active state because it has no being queried and still doesn't known a route is missing or it already removed it
For me it is answer "D". Please, see:
https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/118974-technote-eigrp-00.html
https://www.ciscolive.com/c/dam/r/ciscolive/us/docs/2019/pdf/BRKRST-2331.pdf
None is correct. Having an route with active status is not good in eigrp. None will resolve issue since R1 has this route already marked as active. R1 need to resolve connected network problem.
None is correct, I think we should advertise 10.20.10.0/24 into R1 correctly, so it wouldn't show as unreachable. Closer answer is C but with the correct subnet
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