From: Geert Nijs (geert.nijs@simac.be)
Date: Wed Jun 13 2007 - 04:26:36 ART
Hello all,
I am looking for the fastest possible neighbor up time on a simple p-t-p fiber link between switches:
SW1(core) ------- fiber ------ SW2
The link is configured as a Layer3 link and has a /31 subnet mask.
However, by default, OSPF uses the broadcast network type for this link, and therefore starts DR/BDR elections.
I now have the following options, i want the fastest possible "neighbor up" or "neighbor down".
Does Cisco have any recommendation regarding this ?
1) core switch is forced DR, edge switch is forced BDR
SW2
interface GigabitEthernet1/0/28
no switchport
ip address 10.56.158.11 255.255.255.254
ip ospf dead-interval minimal hello-multiplier 4
ip ospf priority 1
carrier-delay msec 0
SW1
interface GigabitEthernet1/0/28
no switchport
ip address 10.56.158.11 255.255.255.254
ip ospf dead-interval minimal hello-multiplier 4
ip ospf priority 255
carrier-delay msec 0
2) core switch is forced DR, edge switch is forced DROTHER
SW2
interface GigabitEthernet1/0/28
no switchport
ip address 10.56.158.11 255.255.255.254
ip ospf dead-interval minimal hello-multiplier 4
ip ospf priority 0
carrier-delay msec 0
SW1
interface GigabitEthernet1/0/28
no switchport
ip address 10.56.158.11 255.255.255.254
ip ospf dead-interval minimal hello-multiplier 4
ip ospf priority 255
carrier-delay msec 0
3) completely eliminate DR/BDR election and put interface in p-t-p mode
SW2
interface GigabitEthernet1/0/28
no switchport
ip address 10.56.158.11 255.255.255.254
ip ospf dead-interval minimal hello-multiplier 4
ip ospf network point-to-point
carrier-delay msec 0
SW1
interface GigabitEthernet1/0/28
no switchport
ip address 10.56.158.11 255.255.255.254
ip ospf dead-interval minimal hello-multiplier 4
ip ospf network point-to-point
carrier-delay msec 0
regards,
Geert
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