Increase the ARP cache timeout for OTV in Cisco ASR 1001-X.

[sankarkumardd]

I have a requirement to increase the ARP cache timeout for OTV in Cisco ASR 1001-X.

The default value is 10 minutes and i want to increase it to higher value.

Kindly please suggest a command to get this done.

## logs

Overlay Interface Overlay3
VPN name : htm-overlay3
VPN ID : 1
State : UP
Fwd-capable : Yes
Fwd-ready : Yes
AED-Server : Yes
Backup AED-Server : No
AED Capable : Yes
Join interface(s) : GigabitEthernet0/0/0
Join IPv4 address : 10.0.0.2
Tunnel interface(s) : Tunnel0
Encapsulation format : GRE/IPv4
Site Bridge-Domain : 2222
Capability : Unicast-only
Is Adjacency Server : Yes
Adj Server Configured : Yes
Prim/Sec Adj Svr(s) : 10.0.0.2
OTV instance(s) : 0
FHRP Filtering Enabled : Yes
ARP Suppression Enabled : Yes
ARP Cache Timeout : 600 seconds >>>>>>>>>>> I need to increase this from 10 minutes to 4 hours.

[balaji.bandi]

before changing the arp time, i would suggest reading this article.(you need to adjust other factors also here)

https://netcraftsmen.com/otv-best-practices/

still, you like to change command - arp timeout XXX in seconds in respected interface.

[sankarkumardd]

Hello BB,

I meant to increase the OTV's arp cache time. This has nothing to do with the ARP timeout on the interface which is already set to 4 hours.

Kindly please do advise if there are any commands to increase OTV's ARP cache timeout. I think this has to do something with the ISIS protocol but i am not able to arrive on the exact command.

---

@balaji.bandi wrote:

before changing the arp time, i would suggest reading this article.(you need to adjust other factors also here)

https://netcraftsmen.com/otv-best-practices/

still, you like to change command - arp timeout XXX in seconds in respected interface.

---

[balaji.bandi]

Can you post your OTV configuration look?

[sankarkumardd]

find below the configuration: i am using unicast adjacency server model and this is the adjacency server.

otv fragmentation join-interface GigabitEthernet0/0/0
otv fragmentation join-interface GigabitEthernet0/0/1
otv site-identifier 0000.0000.0007

interface Overlay3
no ip address
otv join-interface GigabitEthernet0/0/0
otv vpn-name htm-overlay3
otv use-adjacency-server 10.0.0.2 unicast-only
otv adjacency-server unicast-only
service instance 8 ethernet
encapsulation dot1q 8
bridge-domain 8

! i have more service instances.

[balaji.bandi]

Can you post :

show otv interface Overlay3 arp-nd-cache

[sankarkumardd]

DE-FTH-OTV-R01#sh otv overlay 3 arp-nd-cache
Overlay3 ARP/ND L3->L2 Address Mapping Cache
BD MAC Layer-3 Address Age (HH:MM:SS) Local/Remote
8 d4c9.3ce3.945e 10.254.160.236 00:08:43 Remote
13 00f2.8b85.4bc0 10.254.66.2 00:02:22 Remote
13 00a0.b826.10f4 10.254.66.150 00:00:07 Remote
13 0030.8c04.39d5 10.254.66.154 00:04:41 Remote
20 00f2.8b85.4bc0 10.254.152.2 00:01:27 Remote
20 000d.6051.f1de 10.254.152.39 00:00:12 Remote
20 0002.5533.9d86 10.254.152.112 00:06:01 Remote
22 00f2.8b85.4bc0 10.254.171.2 00:00:01 Remote