Realizing when and how to make an OSPF virtual connection is a fundamental expertise for BSCI and CCNP test achievement, also how significant it very well may be on your activity! As a CCNA and CCNP up-and-comer, you know the hypothesis of virtual connections, so how about we investigate how to arrange a virtual connection, just as some genuine tips that numerous CCNA and CCNP study aides forget about!
In this design, no switch with an interface in Region 4 has a physical interface in Territory 0. This implies a consistent association with Region 0, a virtual connection, must be constructed.
In the accompanying model, R1 and R3 are neighboring and both have interfaces in Territory 0. R4 has a contiguousness with R3 by means of Territory 34, yet R4 has no physical interface in Region 0 and is publicizing its loopback 220.127.116.11 into OSPF. R1 doesn't have the course to that loopback.
R1#show ip course ospf
18.104.22.168/32 is subnetted, 1 subnets
O 22.214.171.124 [110/11] through 10.1.1.5, 01:05:45, Ethernet0
172.23.0.0/27 is subnetted, 1 subnets
O IA 172.23.23.0 [110/74] through 126.96.36.199, 00:04:14, Serial0
188.8.131.52/32 is subnetted, 1 subnets
O 184.108.40.206 [110/11] through 10.1.1.5, 01:05:45, Ethernet0
To determine this, a virtual connection will be worked somewhere in the range of R3 and R4 through Region 34. The region through which the virtual connection is constructed, the travel zone, can't be a stub region of any sort.
R4(config)#router ospf 1
R4(config-router)#area 34 virtual-interface 220.127.116.11
R3(config)#router ospf 1
2d07h: %OSPF-4-ERRRCV: Got invalid parcel: crisscross region ID, from spine zone must be virtual-interface yet not found from 172.23.23.4, Ethernet0
R3(config)#router ospf 1
R3(config-router)#area 34 virtual-connect 18.104.22.168
2d07h: %OSPF-5-ADJCHG: Procedure 1, Nbr 22.214.171.124 on OSPF_VL0 from Stacking to FULL, Stacking Done
A couple of subtleties important... the virtual connection direction utilizes the remote gadget's Freed, not really the IP address on the interface that is in the travel region. Likewise, don't stress over that blunder message you find in the yield from R3 that is typical and you'll see it until you wrap up the virtual connection.
Continuously affirm the virtual connection with show ip ospf virtual-interface. In the event that you've arranged it accurately, the VL should come up in only seconds.
R3#show ip ospf virtual-connect
Virtual Connection OSPF_VL0 to switch 126.96.36.199 is up
Keep running as interest circuit
DoNotAge LSA permitted.
Travel territory 34, through interface Ethernet0, Cost of utilizing 10
Transmit Deferral is 1 sec, State POINT_TO_POINT,
Clock interims arranged, Hi 10, Dead 40, Hold up 40, Retransmit 5
Hi due in 00:00:00
Nearness State FULL (Hi smothered)
List 2/4, retransmission line length 1, number of retransmission 1
First 0x2C8F8E(15)/0x0(0) Next 0x2C8F8E(15)/0x0(0)
Last retransmission filter length is 1, greatest is 1
Last retransmission output time is 0 msec, greatest is 0 msec
Connection State retransmission due in 3044 msec
Virtual connections are really easy to design, however for reasons unknown they appear to threaten individuals. It's my experience that the mistake message featured in R3's yield above causes a ton of frenzy, however the main thing that message means is that you're not wrapped up the virtual connection yet.
There are three fundamental misconfigurations that reason 99% of virtual connection arrangement issues:
Utilizing an inappropriate OSPF Free worth
Attempting to utilize a stub zone as the travel region
Inability to design interface validation on the virtual connection when Territory 0 is running verification
That last one is the one that gets overlooked! A virtual connection is extremely an augmentation of Territory 0, and if Region 0 is running connection confirmation, the virtual connection must be arranged for it also. Focus on the subtleties. try not to freeze when you see the mistake message on the second switch you arrange with the virtual connection, and you'll be prepared for any virtual connection circumstance at work or in the CCNA/CCNP test room!
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