Disable BFD in multiple Router Sub interfaces that participates in OSPF

Hi team,
Please help me on this. Here is the scenario:
We are on an enterprise set up and running on 100+ routers.
We have 200 to 300+ sub interfaces for virtual circuits
Our protocol is OSPF over MPLS
One of our provider in LA encountered link flaps on SONET causing our LA router that is directly connected to that link to recalculate multiple times.
Recalculation of OSPF routes caused disconnection of users in LA VM's.
We were advised by our provider in LA to disable BFD so minor link flaps will no affect recalculation of routes.
We are now tasked by our design team to Disable BFD in multiple Router Sub interfaces that participates in OSPF.
My questions are:
What is the implication in disabling all BFD in routers' interface and sub interface?
Will this improve recalculation of OSPF routes in cause of link flaps or it will totally ignore the link flaps?
Will the routers only recognize a "full down" status of the interface?
How can we Disable BFD in multiple Router Sub interfaces that participates in OSPF in a faster way? Or do we have to do this one by one?
Please advise before we present this to the CAB and implementation. Thank you.

My questions are:
What is the implication in disabling all BFD in routers' interface and sub interface?
Answer: the implication would be eliminating sub-second millisecond convergence.
BFD detect failure at the link layer very fast , once detected it informs the upper layer protocol about the failure causing it to converge immediately.
Will this improve recalculation of OSPF routes in cause of link flaps or it will totally ignore the link flaps?
Answer: if your Provider experiencing intermittent flaps, then yes it will be advisable to turn BFD off. this however doesn't totally ignore the link flaps, once the upper protocol detect the failure based on the dead interval parameter on OSPF, it will recalculate OSPF routes again. Keep in mind, if you have redundant or more links to your provider , then I wouldn't recommend disabling BFD , as it should improve Convergence and you shouldn't notice the failure.
Will the routers only recognize a "full down" status of the interface?
Answer: disabling BFD allows the router recognize a full down status once the upper protocol dead interval occurs or full down status of interface. which ever occurs the earliest.
How can we Disable BFD in multiple Router Sub interfaces that participates in OSPF in a faster way? Or do we have to do this one by one?
You can disable it one by one. or if you have configuration management software, it allows you to do it for all nodes at a time. but this depends if you have it or not.
Please consider not to disable BFD if you have multiple OSPF links towards your provider from any branch, as it shouldn't impact your VMs, it should rather improve Convergence at milliseconds which is absolutely not noticeable.
BR,
Mohamed

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I am trying to create a VPN tunnel between two Cisco ASAs where one ASA has multiple sub-interfaces.
Say, In Cisco ASA 5550(in datacentre), I created multiple subinterfaces with VLAN ID as below:
Inside, int0/1 : 10.1.1.0/24
DMZ, int0/1.100: 10.1.100.0/24 (VLAN 100)
Production, int 0/1.101 : 10.1.101.0/24 (VLAN 101)
Management, int 0/1.102: 10.1.102.0/24 (VLAN 102)
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Hello,
The diagram is helpful.
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Peter

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line aux 0
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no exec
line 2
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transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
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access-class 23 in
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scheduler allocate 20000 1000
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Can you change the interface to outside interface in this command
ip nat inside source list LAN_NAT_POLICY interface GigabitEthernet0/1.1 ov
can you try this below command
ip nat inside source list LAN_NAT_POLICY interface GigabitEthernet0/0 ov
Regards
PrajithTR

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a vlan is usually the equivalent of an l3 subnet, so linking 2 vlans together in the same bridge domain, likely needs to come with some sort of routing (eg a BVI interface).
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regards
xander

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attached visio.
Any clues??
Thnx
Sandev

Hello Sande,
That is correct! Please mark this question as answered so future users having a similar problem can learn from your
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Prime 2.0 monitor sub interface

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