I have a system where the Main location has multiple branches . All the branches have their own MetroEthernet circuit on a 3650 that comes back to a single interface at the Main location's 4500. This is why it is configured as a point-to multipoint. In addition to the PtoMp, we have to seperate public and staff traffic so we use VRF lite. The Metro E interface at each location is configured as a dot1q trunk port with a L3 SVI for each VRF instance. There is a seperate OSPF instance for each VRF. These have been running fine since we put them in last fall but about a month ago one branch started filling the logs with this:
%OSPF-5-ADJCHG: Process 2, Nbr 2.2.2.1 on Vlan2 from DOWN to DOWN, Neighbor Down: Ignore timer expired
%OSPF-5-ADJCHG: Process 2, Nbr 2.2.2.1 on Vlan2 from EXSTART to DOWN, Neighbor Down: Too many retransmissions
What's strange is that when I show OSPF neighbors for that VRF all the other branches show as having a Full adjacency except for Main . The EXSTART error in every bit of documentation I can find indicates a MTU error but the base OSPF instance isn't having this problem and it's on the same physical interface. I've looked for a bug and don't see any. I rebooted the switch in question and it didn't solve the problem. Today, another branch rebooted due to a power outage and now I'm getting this error on it as well.
Please help, not sure what's causing this.
Thanks ,
Bonnushka
GigabitEthernet1/0/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 58f3.9c0b.9e01 (bia 58f3.9c0b.9e01)
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
2.2.2.1 0 EXSTART/ - 00:01:59 2.2.2.1 Vlan2
2.2.2.3 0 FULL/ - 00:01:36 2.2.2.3 Vlan2
2.2.2.13 0 FULL/ - 00:01:34 2.2.2.13 Vlan2
2.2.2.4 0 FULL/ - 00:01:45 2.2.2.4 Vlan2
2.2.2.20 0 FULL/ - 00:01:39 2.2.2.20 Vlan2
1.1.1.1 0 FULL/ - 00:01:42 1.1.1.1 Vlan10
1.1.1.3 0 FULL/ - 00:01:54 1.1.1.3 Vlan10
1.1.1.13 0 FULL/ - 00:01:42 1.1.1.13 Vlan10
1.1.1.4 0 FULL/ - 00:01:54 1.1.1.4 Vlan10
1.1.1.16 0 FULL/ - 00:01:57 1.1.1.16 Vlan10
EX:
Main Location Router:
int vlan 10
ip add 1.1.1.1 255.255.255.0
ip ospf point-to-multipoint
int vlan 20
ip vrf forwarding Public
ip add 2.2.2.1 255.255.255.0
ip ospf point-to-multipoint
Branches:
interface GigabitEthernet1/0/1
switchport trunk allowed vlan 10,20
switchport mode trunk
speed 100
duplex full
int vlan 10
ip add 1.1.1.2(through 20) 255.255.255.0
ip ospf network point-to-multipoint
int vlan 20
ip vrf forwarding Public
ip add 2.2.2.2(through 20) 255.255.255.0
ip ospf network point-to-multipoint
