OSPF asynchronous routing with two channels

miko · Tue Jul 23, 2024 10:02 am

Hi,
There are 2 channels between the routers (GRE-tunnel).

1 router.

/routing ospf instance
add distribute-default=always-as-type-1 in-filter=ospf-in-gre name=ospf-gre out-filter=ospf-out-gre router-id=10.0.0.254
/routing ospf interface
add interface=gre-tunnel1 network-type=point-to-point
add cost=30 interface=gre-tunnel2 network-type=point-to-point
/routing ospf area
add area-id=1.1.1.1 default-cost=1 inject-summary-lsas=yes instance=ospf-gre name=area1 translator-role=translate-never type=nssa

2 router.

/routing ospf instance
set [ find default=yes ] redistribute-connected=as-type-1 redistribute-static=as-type-1 router-id=10.0.0.251
/routing ospf interface
add interface=gre-tunnel1 network-type=point-to-point
add cost=30 interface=gre-tunnel2 network-type=point-to-point
/routing ospf area
add area-id=1.1.1.1 default-cost=1 inject-summary-lsas=yes name=area1 translator-role=translate-never type=nssa

When the connection is lost, a switch occurs, but when the connection is restored, router 2 switches but router 1 (ABR) does not.

1.PNG

2.PNG

I have never encountered channel reservation in OSPF before and I don’t understand why this behavior occurs.

miko · Wed Jul 24, 2024 4:39 pm

Maybe someone will help, or someone will express their thoughts, at the moment it worked as it should, but I had to change the zone type to default.
It didn’t work in the NSSA zone. Problem with asymmetric routing with only default route. The rest of the networks worked correctly during distribution.

OSPF asynchronous routing with two channels

OSPF asynchronous routing with two channels

Re: OSPF asynchronous routing with two channels

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