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Exam JN0-648 topic 1 question 21 discussion

Actual exam question from Juniper's JN0-648
Question #: 21
Topic #: 1
[All JN0-648 Questions]

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There is a functioning OSPFv3 neighborship between Router-1 and Router-2 over the ge-0/0/1 link. However, the 172.100.100.0/24 and 172.101.101.100/24 routes are not being shared through OSPFv3.
Referring to the configuration shown in the exhibit, which two actions must you take to solve the problem? (Choose two.)

  • A. Add interface ge-0/0/1 under the IPv4 unicast realm for both routers.
  • B. Add the IPv6 family protocol under ge-0/0/2 for both routers.
  • C. Add the lo0 interface under OSPFv3 for both routers.
  • D. Add interface ge-0/0/2 under OSPFv3 for both routers.
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Suggested Answer: AB 🗳️
by rrahim at Dec. 22, 2020, 11:57 p.m.

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nushadu
3 years, 5 months ago
pay attention to Prefix 10.0.24.0/24 ed@vMX-PE2# ...r 2.2.2.2 intra-area-prefix extensive realm ipv4-unicast OSPF3 database, Area 0.0.0.0 Type ID Adv Rtr Seq Age Cksum Len IntraArPfx *0.0.0.1 2.2.2.2 0x80000006 196 0x4c0a 56 Ref-lsa-type Router, Ref-lsa-id 0.0.0.0, Ref-router-id 2.2.2.2 Prefix-count 3 Prefix 10.0.0.0/24 Prefix-options 0x0, Metric 1 Prefix 10.0.24.0/24 Prefix-options 0x0, Metric 1 Prefix 2.2.2.2/32 Prefix-options 0x2, Metric 0 Gen timer 00:46:44 Aging timer 00:56:44 Installed 00:03:16 ago, expires in 00:56:44, sent 00:03:16 ago Last changed 00:03:16 ago, Change count: 5, Ours [edit]
upvoted 1 times
nushadu
3 years, 5 months ago
disable "family ipv6" on the port ed@vMX-PE2# deactivate interfaces em1.2 family inet6 [edit] ed@vMX-PE2# show | compare [edit interfaces em1 unit 2] ! inactive: family inet6 { ... } [edit] ed@vMX-PE2# commit check configuration check succeeds [edit] ed@vMX-PE2# commit commit complete [edit]
upvoted 1 times
nushadu
3 years, 5 months ago
Prefix 10.0.24.0/24 disapeared (because disabled family inet6) ed@vMX-PE2# ...er 2.2.2.2 intra-area-prefix extensive realm ipv4-unicast OSPF3 database, Area 0.0.0.0 Type ID Adv Rtr Seq Age Cksum Len IntraArPfx *0.0.0.1 2.2.2.2 0x80000007 5 0x9a01 48 Ref-lsa-type Router, Ref-lsa-id 0.0.0.0, Ref-router-id 2.2.2.2 Prefix-count 2 Prefix 10.0.0.0/24 Prefix-options 0x0, Metric 1 Prefix 2.2.2.2/32 Prefix-options 0x2, Metric 0 Gen timer 00:49:54 Aging timer 00:59:54 Installed 00:00:05 ago, expires in 00:59:55, sent 00:00:05 ago Last changed 00:00:05 ago, Change count: 6, Ours [edit] ed@vMX-PE2#
upvoted 1 times
nushadu
3 years, 5 months ago
ed@vMX-PE2# show interfaces em1.2 | display set set interfaces em1 unit 2 vlan-id 2 set interfaces em1 unit 2 family inet address 10.0.24.2/24 set interfaces em1 unit 2 family inet6 deactivate interfaces em1 unit 2 family inet6 [edit] ed@vMX-PE2# show protocols ospf3 | display set set protocols ospf3 realm ipv4-unicast area 0.0.0.0 interface lo0.0 set protocols ospf3 realm ipv4-unicast area 0.0.0.0 interface em1.2 passive set protocols ospf3 realm ipv4-unicast area 0.0.0.0 interface em0.2 interface-type p2p set protocols ospf3 area 0.0.0.0 interface em0.2 interface-type p2p set protocols ospf3 area 0.0.0.0 interface lo0.0 [edit] ed@vMX-PE2#
upvoted 1 times
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jjh
3 years, 8 months ago
https://njetwork.wordpress.com/2013/02/01/ospfv3-as-a-ipv4-router/
upvoted 1 times
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rrahim
4 years, 4 months ago
not sure why inet6 must be added for ipv4 routes to work but here is config guide: https://www.juniper.net/documentation/en_US/junos/topics/topic-map/configuring-ospf-interfaces.html#id-example-configuring-ospfv2-peer-interfaces To quickly configure multiple address families for OSPFv3, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, copy and paste the commands into the CLI at the [edit] hierarchy level, and then enter commit from configuration mode. content_copy zoom_out_map [edit] set interfaces fe-0/1/0 unit 0 family inet address 192.0.2.2/24 set interfaces fe-0/1/0 unit 0 family inet6 set protocols ospf3 area 0.0.0.0 interface fe-0/1/0 set protocols ospf3 realm ipv4-unicast area 0.0.0.0 interface fe-0/1/0
upvoted 4 times
Plinkity_Plonk
4 years, 2 months ago
From my old JNCIS notes: "Each interface that is being included in a realm must have inet6 enabled because ospfv3 uses the link local IP to source hello packets."
upvoted 5 times
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hyena
3 years, 6 months ago
Configure OSPFv3 to advertise address families other than unicast IPv6. Junos OS maps each address family you configure to a separate realm with its own set of neighbors and link-state database. https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/ref/statement/realm-edit-protocols-ospf3.html
upvoted 1 times
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