Refer to the exhibit. An engineer has configured R1 as EIGRP stub router. After the configuration, router R3 failed to reach to R2 loopback address. Which action advertises R2 loopback back into the R3 routing table?
A.
Add a static route for R2 loopback address in R1 and redistribute it to advertise to R3.
B.
Use a leak map on R1 that matches the required prefix and apply it with the distribute list command toward R3.
C.
Use a leak map on R3 that matches the required prefix and apply it with the EIGRP stub feature.
D.
Add a static null route for R2 loopback address in R1 and redistribute it to advertise to R3.
In my opinion the answer is C
Here is the config I assume is configured on the routers based on the problem
*R1*
router eigrp 10
network 0.0.0.0
eigrp stub connected summary leak-map LEAK
ip prefix-list TEST seq 5 permit 2.2.2.2/32
route-map LEAK permit 10
match ip address prefix-list TEST
*R2*
router eigrp 10
network 0.0.0.0
*R3*
router eigrp 10
network 0.0.0.0
A) This is the configuration that this answer is suggesting.
ip route 2.2.2.2 255.255.255.255 192.168.12.2
redistribute static metric 1000000 10 255 1 1500
However, the answer is missing the command "eigrp stub connected static"
B) The command does not exist
R1(config-router)#distribute-list ?
<1-199> IP access list number
<1300-2699> IP expanded access list number
WORD Access-list name
gateway Filtering incoming address updates based on gateway
prefix Filter prefixes in address updates
route-map Filter prefixes based on the route-map
C) Correct
D) Does not make any sense
B as everyone is said is not even possible , there is no such a command with distribution list .
I go with A , for A to work we need to know the configuration of R1 . In order for this to work , we need
1) to create static route for R2 lo0
2) under eigrp process , when we are configuring the stub function , we won't just let the default stub, advertising connected and summary. We need to configure " eigrp stub connected static" , then in R3 , we will see as D EX 2.2.2.2 .
So I only counted that they configure that. A is the answer
B is Wrong !!! . If you do this your access list has deny any on the end of the ACE , so the network between R1-R2 ( 192.168.12.0 ) and R1-R3 , are filtered also . Putting permit any in the end , also doesn't help . Leak map doesn't exist in distribution command .
Answer seems to be A.
I will lab to verify on my own but the rest are not correct.
B. there is no distribute-list leak-map command
C. This is applying the change to R3. Since R1 is a stub as well, it is not propagating R2 to R3 routes.
D. If we add a static null route for R2 loopback, we lose reachability to R2 loopback.
R1
router eigrp 1
network 1.1.1.0 0.0.0.255
network 192.168.12.0
network 192.168.13.0
eigrp router-id 1.1.1.1
eigrp stub connected summary
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
ip route 2.2.2.2 255.255.255.255 192.168.12.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R1(config-router)#router eigrp 1
R1(config-router)#stub static connected
we need the connected keyword to advertise the links between the routers
R3#ping 2.2.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/5/6 ms
R3#
B doesn't exist as a command
R1(config-router)#distribute-list ?
<1-199> IP access list number
<1300-2699> IP expanded access list number
WORD Access-list name
gateway Filtering incoming address updates based on gateway
prefix Filter prefixes in address updates
route-map Filter prefixes based on the route-map
Im going with A on this just because answer B mention distribute list, thats not correct. We should use a prefix list with a route map or something like that.
the only one that can be right is A, the answer B is using a distribute list instead of a route-map that's the bad thing about this.
The point is that we need also to remember that when eigrp stub is enabled by default you can only advertise connected network and summary networks, if we want to redistribute static routes we need to add the command eigrp stub connected summary static
this is the output afer the command mentioned:
Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
Soft SIA disabled
NSF-aware route hold timer is 240
Router-ID: 192.168.34.2
Stub, connected, static, summary
Topology : 0 (base)
Active Timer: 3 min
The example you supplied matches the question. So i agree it should be B. Also strange that we get this question on CCNP as it seems out of scope of the exam. By the way, love the example, so simple!
That's not true, you do NOT use a distribute list for create a leak-map, in fact if you look the configuration there is configured a route-map that is matching the 3.3.3.3/32 prefix and then is going to apply the leak map in the eigrp stub command using also the leak map the distribute list in NOT used
In the example you have supplied shows if we want to use leak-map we have the option:
eigrp stub leak-map <leak map name>
There is no such option as distribute-list regarding leak-map, but redistribute command works as HungarianDish labbed: Correct answer is A
As previously mentioned (for example by HungarianDish) there is no such possibilty eigrp leak-map with distribute list. I also labbed the configuration, and I agree with HungarianDish, that answer is "A". Even the wording is met.
I don't know why but this questions seems like it's asking about leak-map feature of EIGRP stub configuration... I can't explain but I have this feeling maybe it's because there is no other question talking about leak-map. Therefor it's B to me.
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