PeraHoman
asked on
Downtime: OSPF
Core Switch
interface vlan 10
ip address 10.10.1.1 255.255.255.0
router ospf 10
passive-interface default
no passive-interface g1/0/12
network 10.10.1.0 0.0.0.255 area 100
inter g1/0/12
description Core Switch to Router link
ip address 10.23.2.1 255.255.255.252
Access Switch
vlan 10
exit
To be configured in the future
interface g1/0/1
switchport mode access
switchport access vlan 10
no shut
Assumptions: Every other configuration needed is good (Router, STP, Trunk, DHCP, DNS, etc.) What I'm wondering is, if I inject the 10.10.1.0/24 network statement into OSPF, and nothing is connected to it, then OSPF will not reconverge? When I finally connect a workstation at the access switch under VLAN 10 at a later date, OSPF will now reconverge?
Interface VLAN 10 isn't participating in OSPF because of passive-interface default, but it still participates in advertising its network because of the static network statement. If anything, will I have any sort of downtime if I did the scenario where OSPF 10.10.1.0/24 statement is configured ahead of time, and at a later date will finally participate in advertising when the workstation is added?
interface vlan 10
ip address 10.10.1.1 255.255.255.0
router ospf 10
passive-interface default
no passive-interface g1/0/12
network 10.10.1.0 0.0.0.255 area 100
inter g1/0/12
description Core Switch to Router link
ip address 10.23.2.1 255.255.255.252
Access Switch
vlan 10
exit
To be configured in the future
interface g1/0/1
switchport mode access
switchport access vlan 10
no shut
Assumptions: Every other configuration needed is good (Router, STP, Trunk, DHCP, DNS, etc.) What I'm wondering is, if I inject the 10.10.1.0/24 network statement into OSPF, and nothing is connected to it, then OSPF will not reconverge? When I finally connect a workstation at the access switch under VLAN 10 at a later date, OSPF will now reconverge?
Interface VLAN 10 isn't participating in OSPF because of passive-interface default, but it still participates in advertising its network because of the static network statement. If anything, will I have any sort of downtime if I did the scenario where OSPF 10.10.1.0/24 statement is configured ahead of time, and at a later date will finally participate in advertising when the workstation is added?
ASKER
It's a standard we go by. From what I've read, if an interface is passive it will not participate in OSPF (LSA updates etc), but it will still advertise the network which will go into the routing table.
sho ip route ospf is very large (Large MPLS).
sho ip route ospf is very large (Large MPLS).
Hi There,
Kindly confirm if the config has been executed:
Post the below output.
sh ip route ospf | i 10.10.1.
Kindly confirm if the config has been executed:
Post the below output.
sh ip route ospf | i 10.10.1.
The route for 10.10.1/24 will be distributed by OSPF. If you want to hold off advertising that route before you start connecting workstations, shut down int vlan 10. Passive interface just doesn't send routing updates.
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Could you post the output of #sh ip route ospf?
Kindly confirm the reason behind declaring the vlan as passive and advertising the same network statically.