Refer to the exhibit. An engineer is trying to redistribute OSPF to BGP, but not all of the routes are redistributed. What is the reason for this issue?
A.
By default, only internal routes and external type 1 routes are redistributed into BGP
B.
Only classful networks are redistributed from OSPF to BGP
C.
BGP convergence is slow, so the route will eventually be present in the BGP table
D.
By default, only internal OSPF routes are redistributed into BGP
The answer is correct is D.
Reference: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/5242-bgp-ospf-redis.html?dtid=osscdc000283#redistributionofonlyospfinternalroutesintobgp
D is correct.
Use the external keyword along with the redistribute command under router bgp to redistribute OSPF external routes into BGP. With the external keyword, you have three choices: Redistribute both External Type-1 and Type-2 (Default)
Redistribute Type-1
Redistribute Type-2
D is correct. If you configure the redistribution of OSPF into BGP without keywords, only OSPF intra-area and inter-area routes are redistributed into BGP, by default
https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/5242-bgp-ospf-redis.html?dtid=osscdc000283#redistributionofonlyospfinternalroutesintobgp
D is correct.
"If you configure the redistribution of OSPF into BGP without keywords, only OSPF intra-area and inter-area routes are redistributed into BGP, by default. "
If you configure the redistribution of OSPF into BGP without keywords, only OSPF intra-area and inter-area routes are redistributed into BGP, by default. You can use the internal keyword along with the redistribute command under router bgp to redistribute OSPF intra- and inter-area routes.
b is the correct ans, by default only classful network will be redistributed from ospf to other routing protocol unless you added subnet command at the end
The "subnet" keyword is only used to redistribute INTO OSPF, not from.
https://learningnetwork.cisco.com/s/question/0D53i00000Kt6nCCAR/redistribute-subnet-keyword
After reading from the links provided to Cisco regarding redistributing OSPF into BGP, quoting directly from Cisco
Note: The configuration shows match external 1 external 2 and the command entered was redistribute ospf 1 match external. This is normal because OSPF automatically appends "external 1 external 2" in the configuration. It matches both OSPF external 1 and external 2 routes and it redistributes both routes into BGP.
So D is incorrect as well.
But what you're quoting is on the section to, explicitly, redistribute Only OSPF External (type 1 and 2) into BGP.
On the section above, it talks about the redistribution of OSPF internal routes into BGP and it says that that is the default redistribution (with no keywords):
"If you configure the redistribution of OSPF into BGP without keywords, only OSPF intra-area and inter-area routes are redistributed into BGP, by default."
D
Probably to avoid risking a loop advertising external routes outside OSPF domain that can cause a loop not detected by BGP due to lack of ASN in OSPF info during redistribution?
Answer is D. https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/5242-bgp-ospfredis.
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