Original Message:
Sent: 03-01-2024 02:32
From: CHINGIZ MAMMADOV
Subject: Multiple areas adjacency on same physical link
Hello,
Have you checked "multiarea adjacency" - secondary interface for your case or you need to run ospf3?
set protocol ospf area 0.0.0.0 interface gig 0/0/1.199
set protocol ospf area 0.0.0.1 interface gig 0/0/1.199 secondary
In this case you don't need secondary IP ( 200.200.200.1/30).
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CHINGIZ MAMMADOV
Original Message:
Sent: 02-28-2024 22:43
From: LEEBAHI
Subject: Multiple areas adjacency on same physical link
Hi everyone,
Currently we are running OSPFV2 between our two DC connected by L2 pipe by a service provider (SP)
DC1 gig0/0/1.199------SP1----------0/0/1.199-gig-DC2
DC1 and DC2 are running OSPFV2 on gig 0/0/0.199 which has subnet 199.199.199.0/30, DC1 ( 199.199.199.1) and DC2 ( 199.199.199.2) see themselves as neighbors in area 0.
DC1 and DC2 has many spokes sites in area 1. In order to avoid suboptimal routing between DC and a spoke ( if spoke loses its connection to DC) because intra area routes are preferred over inter-area routes, we needed to establish another OSPF adjacency between DC1 and DC2 in area 1. Since provider only expects single vlan tag traffic from DC1 and DC2, we therefore set up another IP under gig 0/0.199 on DC 1 and DC2 . 200.200.200.1/30 and 200.200.200.2/30 and place this subnet in area 1 by using:
DC1:
set protocols ospf area 0.0.0.1 interface 200.200.200.1 interface-type p2p
DC2:
set protocols ospf area 0.0.0.1 interface 200.200.200.2 interface-type p2p
This allows DC1 and DC2 to see OSPF neighbors in two different areas on same physical link gig 0/0/0.199
DC1 sees following:
199.199.199.2 gig 0/0/.199 full ( area 0)
200.200.200.2 gig 0/0.199 full ( area 1)
Everything is working as expected.
If we want to replace OSPFV2 with OSPF3 ream ipv4-unicast . But I do not see any command that allows me to run OSPF3 on single physical link like we do in OSPFV2
EXAMPLE:
DC1:
int gig 0/0/1.199
199.199.199.199.1/30
200.200.200.1/30
set protocol ospf area 0.0.0.0 interface gig 0/0/1.199
set protocol ospf area 0.0.0.1 interface 200.200.200.1
But not such option available in OSPF3
Thanks !!
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Be kind!!
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