Hello,
I've been trying to add the multi area adjacency feature in a multi-vendor environment where IOS-XR was present also.
According to the documentation
[1] Cisco's implementation of Multi-Area Adjacency for OSPF Version 2 :
"This feature establishes a point-to-point unnumbered link in an OSPF area."
[2] Cisco's implementation of unnumbered OSPF interface :
"When an unnumbered interface is configured, it references another interface on the router. When enabling OSPF on the unnumbered interface, use the address-wild-mask pair of interfaces to which the unnumbered interface is pointing.
Config is basic single physical interface.
Config :
RP/0/RSP0/CPU0:ASR-9010#show running-config formal router ospf
Fri Mar 10 03:05:17.418 UTC
router ospf 1 router-id 192.168.100.1
router ospf 1 area 0
router ospf 1 area 0 interface Loopback0
router ospf 1 area 0 interface Loopback0 passive enable
router ospf 1 area 0 interface TenGigE0/5/0/2.10
router ospf 1 area 0 interface TenGigE0/5/0/2.10 network point-to-point
router ospf 1 area 1
router ospf 1 area 1 multi-area-interface TenGigE0/5/0/2.10
interface TenGigE0/5/0/2.10
ipv4 address 101.10.10.1 255.255.255.254
encapsulation dot1q 10
interface Loopback0
ipv4 address 192.168.100.1 255.255.255.255
Logs :
P/0/RSP0/CPU0:Mar 10 03:04:48.067 : ospf[1019]: Send hello to 224.0.0.5 area 1 on MADJ: TenGigE0/5/0/2.10 from 0.0.0.0 (nbr/if state 3/4)
RP/0/RSP0/CPU0:Mar 10 03:04:48.067 : ospf[1019]: Send hello pkt pri 1 options 0x12 DR 0.0.0.0 BDR 0.0.0.0 hello 10 dead 40 netmask 255.255.255.255, vrf default vrfid 0x60000000
Why this is important : Juniper for example copies the netmask from the primary area's interface and in their case they are not allowing netmask mismatch on the Ethernet point-to-point interfaces as Cisco does. As a result a multi-area adjacency does not form.
Am I missing something ? Shouldn't the netmask be the same on the second adjacency ? I
Thank you,
Dan
