Hi.
I have a problem where two EX9200 switches configured in MC-LAG do not seem tp replicate their ARPs between each other.
The situatio is:
Someone deploys a VM and is assigned an IP
They then destory that VM and deploy and new one and they get the same IP but a differnet MAC.
The new IP/MAP (ARP) is learnt on one switch, but it does not get synchroinzed to the other switch.
Here is the output:
So here on switch2, you can see the ARP changes automatically
me@switch2> show arp hostname 192.1.1.1 no-resolve
May 27 01:05:16
MAC Address Address Interface Flags
04:01:1a:53:31:01 192.1.1.1 ae62.0 none
{master}
me@switch2> show arp hostname 192.1.1.1 no-resolve
May 27 01:05:28
MAC Address Address Interface Flags
04:01:1a:53:36:01 192.1.1.1 ae62.0 none
But on switch1 it takes about 6 minuyes to change... see the timestamps on each show command
me@switch1> show arp hostname 192.1.1.1 no-resolve
May 27 01:02:47
MAC Address Address Interface Flags
04:01:1a:53:31:01 192.1.1.1 ae62.0 none
{master}
me@switch1> show arp hostname 192.1.1.1 no-resolve
May 27 01:02:51
MAC Address Address Interface Flags
04:01:1a:53:31:01 192.1.1.1 ae62.0 none
{master}
me@switch1> show arp hostname 192.1.1.1 no-resolve
May 27 01:03:00
MAC Address Address Interface Flags
04:01:1a:53:31:01 192.1.1.1 ae62.0 none
{master}
me@switch1> show arp hostname 192.1.1.1 no-resolve
May 27 01:03:29
MAC Address Address Interface Flags
04:01:1a:53:31:01 192.1.1.1 ae62.0 none
{master}
me@switch1> show arp hostname 192.1.1.1 no-resolve
May 27 01:04:58
MAC Address Address Interface Flags
04:01:1a:53:31:01 192.1.1.1 ae62.0 none
me@switch1> show arp hostname 192.1.1.1 no-resolve
May 27 01:08:16
MAC Address Address Interface Flags
04:01:1a:53:36:01 192.1.1.1 ae62.0 none
So it finally changes ater about 6 minutes.
Any idea why this is happening. ICCP should be replicating this.
Running Junos 12.3R5.7, EX9208.
I did notice this in the release notes... It could be related:
On EX9200 switches, dynamic ARP resolution is not supported over inter chassis control
links(ICLs). As aworkaround, configure static ARP on both ends of the ICL.[PR/850741:
This is a known software limitation.]