Refer to the exhibit. A network engineer connected two routers using OSPF but the routers are not sharing routes. Which command completes the configuration?
A.
router ospf 1 no passive-interface GigabitEthernet5
B.
interface GigabitEthernet5 no passive-interface
C.
router ospf 1 network 172.16.252.0 0.0.0.255 area 0
I read this as the Engineer has configured two routers but we're only seeing output from one of them.
The Other router connects to the Interface G6 and the connection on G5 is to a switch so is a red herring.
Answers A & B are then discounted as they reference the wrong interface, leaving D as the correct answer
Isn't the link to the router on Gig6? No other answer removes the passive-interface from Gig6.
This is how I understood the question. An engineer connected 2 routers, the one we're configuring and another one (probably the one connected to int GigE6), so we need an answer that will enable OSPF on that interface. However, even if the L3 switch on GigE5 is required, the only answer that includes both interfaces is D.
Both A and D work but for this question the answer is D.
"A" works if you are only trying to share routes with one of the routers but the question says "but the routers are not sharing routes." Aka it is implying we want to share routes with both routers, not just one. Out of these options, D is the only one that lets you share routes with both routers.
It is recommended to configure passive-interface default under the OSPF routing process and specifically enable the interfaces where routing adjacencies are to be formed.
"...R1 fails and then regains operational status, it must allow 100 seconds for the routing protocol to converge before preemption takes effect."
So R1 is active than goes down and R2 takes the active role. Once R1 come up it has to wait for 100 sec till it takes over the active role
Preemption delay hast to be set on R1 to "tell" the router to wait 100 sec...
standby 300 preempt delay minimum 100
(one comment: standby [ group-number] preempt [ delay{ [ minimum seconds] [ reload seconds] [ sync seconds]}] ) --> standby 300 delay minimum 100 is missing the preempt command
First the state is Listen and start countdown (98 remaining)
SW2#show standby
Vlan100 - Group 300 (version 2)
State is Listen
Preemption enabled, delay min 100 secs (98 remaining)
Once it is ready it goes into the Standby state and countdown is conituned (67 remaning)
*Mar 20 11:56:41.501: %HSRP-5-STATECHANGE: Vlan100 Grp 300 state Speak -> Standby
SW2#show standby
Vlan100 - Group 300 (version 2)
State is Standby
Preemption enabled, delay min 100 secs (67 remaining)
If we need all interfaces to be passive interfaces and leaving a single or a couple of interfaces non-passive, we can set passive interface as the default configuration by using the ‘passive-interface default’ command:
Router#conf t
Router(config)#router ospf 1
Router(config-router)#passive-interface default
Router(config-router)#no passive-interface gi0/0/0
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