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ARP between 2 trunk ports

Hi,

1 server is sending ARP:

ARP, Request who-has 10.5.5.1 tell 10.5.5.4, length 28
15:02:41.730705 ARP, Request who-has 10.5.5.1 tell 10.5.5.4, length 28
15:02:42.732173 ARP, Request who-has 10.5.5.1 tell 10.5.5.4, length 28
15:02:43.730709 ARP, Request who-has 10.5.5.1 tell 10.5.5.4, length 28
15:02:44.730759 ARP, Request who-has 10.5.5.1 tell 10.5.5.4, length 28
15:02:45.732312 ARP, Request who-has 10.5.5.1 tell 10.5.5.4, length 28
15:02:46.730717 ARP, Request who-has 10.5.5.1 tell 10.5.5.4, length 28

 

now when i do tcpdump on the 2nd server those ARP are not there.

 

the 2 servers are configured with trunk ports. like so:

interface GigabitEthernet1/20
 description openstack from compute node, cable17
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 10,11
 switchport mode trunk
 logging event link-status
 logging event trunk-status
!
interface GigabitEthernet1/21
 description openstack from network node, cable140
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 10,11
 switchport mode trunk
 logging event link-status
 logging event trunk-status

 

why the ARP is not getting to the 2nd server? it is a broadcast.

no acl and no arp inspection are configured. and "sh logging" is fine.

also dhcp broadcast is working ok between the 2 servers.

  • LAN Switching and Routing
1 REPLY

Are you running the TCPDUMP

Are you running the TCPDUMP on the correct interface on server 2, the port should be in correct vlan to see the broadcast for that vlan  ?

would you please tell us more about the configuration on the server side ?

 

 

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