Buy or Renew
Buy or Renew
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 
cancel
Start a conversation
8303
Views
0
Helpful
1
Replies

mac address-table aging-time on Nexus and IOS

net-harry
Level 1
Level 1

‎04-06-2011 08:23 AM - edited ‎03-06-2019 04:28 PM

Hi,

We have two Nexus 7000 switches in the core and a number of Nexus 5000 and Catalysts connected to them.

I noticed that the default "mac address-table aging-time" on the 7000s is 1800 seconds, while the default value on 5000s and Catalyst switches is 300 seconds.

Is there a good reason why the value is much larger on the 7000s or should we change the setting on them to 300 seconds?

Thanks in advance for your help!

Best regards,

Harry

1 person had this problem
Labels:
0 Helpful
1 Reply 1

Jayakrishna Mada
Cisco Employee
Cisco Employee

‎04-09-2011 11:37 AM

Hi Harry,

Thats correct the default mac-aging timer on Nexus is changed to 1800 sec if you notice the ARP aging timer is changed to 1500 secs. One of the main reason for this change is to avold unicast flooding in the network due to assymetric routing.

Since Nexus 5000 are l2 switches only the mac-aging timer is unchanged.

I would suggest to leave the timers default unless there is a need to change.

JayaKrishna

0 Helpful
Customers Also Viewed These Support Documents