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PaulReveco
Beginner

ARP inspection

Hello community,

Due to more arp inputs than the 200 that were configured, it had to be set to None. That you should pay attention to determine a margin.

 

 

SW1_K4_PISO_5# show ip arp inspection interfaces | i None
Gi1/0/44 Untrusted None N/A
Gi1/0/45 Untrusted None N/A
Gi1/0/46 Untrusted None N/A
Gi1/0/47 Trusted None N/A
Gi1/0/48 Untrusted None N/A
Gi1/0/49 Trusted None N/A
Gi1/0/50 Trusted None N/A
SW1_K4_PISO_5#

 

SW1_K4_PISO_5#sho arp summary
Total number of entries in the ARP table: 309.
Total number of Dynamic ARP entries: 308.
Total number of Incomplete ARP entries: 0.
Total number of Interface ARP entries: 1.
Total number of Static ARP entries: 0.
Total number of Alias ARP entries: 0.
Total number of Simple Application ARP entries: 0.
Total number of Application Alias ARP entries: 0.
Total number of Application Timer ARP entries: 0.

Interface Entry Count
Vlan999 309

SW1_K4_PISO_5#

Sep 21 10:25:54: %SW_DAI-4-DHCP_SNOOPING_DENY: 2 Invalid ARPs (Req) on Gi1/0/44, vlan 245.([0042.387f.343d/10.20.0.15/0000.0000.0000/10.20.0.1/10:25:54 Chile-D Tue Sep 21 2021])
Sep 21 10:25:55: %SW_DAI-4-DHCP_SNOOPING_DENY: 2 Invalid ARPs (Req) on Gi1/0/44, vlan 245.([0042.387f.343d/10.20.0.15/0000.0000.0000/10.20.0.1/10:25:55 Chile-D Tue Sep 21 2021])
Sep 21 10:25:56: %SW_DAI-4-DHCP_SNOOPING_DENY: 1 Invalid ARPs (Req) on Gi1/0/44, vlan 245.([0042.387f.343d/10.20.0.15/0000.0000.0000/10.20.0.1/10:25:56 Chile-D Tue Sep 21 2021])
Sep 21 10:26:07: %SW_DAI-4-DHCP_SNOOPING_DENY: 1 Invalid ARPs (Req) on Gi1/0/44, vlan 245.([0042.387f.343d/169.254.8.178/0000.0000.0000/169.254.8.178/10:26:07 Chile-D Tue Sep 21 2021])

 

In another switch there is no problem

--------------------------------------

Interface Trust State Rate (pps) Burst Interval
--------------- ----------- ---------- --------------
Fa0/44   Untrusted    200 1
Fa0/45   Untrusted    200 1
Fa0/46   Untrusted    200 1
Fa0/47   Untrusted    200 1
Fa0/48    Untrusted   200 1

 

interface FastEthernet0/44
description *** Hacia AP ***
switchport trunk native vlan 999
switchport mode trunk
ip arp inspection limit rate 200
storm-control broadcast level 20.00
storm-control multicast level 20.00
storm-control action trap
end

 

SW5_48_K4_Piso2#show arp summary
Total number of entries in the ARP table: 6.
Total number of Dynamic ARP entries: 5.
Total number of Incomplete ARP entries: 0.
Total number of Interface ARP entries: 1.
Total number of Static ARP entries: 0.
Total number of Alias ARP entries: 0.
Total number of Simple Application ARP entries: 0.
Total number of Application Alias ARP entries: 0.
Total number of Application Timer ARP entries: 0.

Interface Entry Count
Vlan999 6

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