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Neighbor shows DRother on point-to-point network

Neighbor shows DRother on point-to-point network

Sulaiman_Al_Dar
New Contributor


hi,

i'm studying EOS in my lab this is my topology

8ade401b35a541ceb6827025388e091b_RackMultipart20180905-101643-1kfyrck-image_inline.png


im configuring OSPF between Core1 (EXOS) and PROD_RTR (Cisco IOS)
both links are set to Point-to-Point
OSPF Neibours came up on both Cisco and EXOS,

on EXOS
Core1.16 # show ospf neighbor
Neighbor ID Pri State Up/Dead Time Address Interface
BFD Session State
==========================================================================================
10.10.10.20 1 FULL /DROTHER 00:00:00:44/00:00:00:03 172.20.20.2 PROD
None on IOS
PROD_RTR#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.10.10.10 0 FULL/ - 00:00:32 172.20.20.1 Ethernet0/0my question, why does it show on EXOS and full /DROTHER?
AFAIK, that state shouldn't show if we are using PTP and network type?
Thanks
1 REPLY 1

Necheporenko__N
Contributor II
Hello Sulaiman Al Darmaki,

It is expected behaviour. OSPF routers may operate as DR, BDR or DROTHER only.
No DR/BDR elected on point-to-point or point-to-multipoint links, so the only "DROTHER" is left.

02ead9e7d1344bd9aad109ed7282fb1d_RackMultipart20180905-52141-vzpfp4-Pasted_Graphic_2_inline.png



Best Regards,
Nikolay

GTM-P2G8KFN