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ARP rate limiting

ARP rate limiting

Created: Sep 16, 2020 09:03:52Latest reply: Sep 16, 2020 09:04:20 580 1 0 0 0
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Hello all,

I'd like to configure ARP rate limiting on the S5720 switch.

From the documentation, the arp anti-attack rate-limit command can be used to set he maximum rate and rate limiting duration of ARP packets globally, in a VLAN, or on an interface, and enables the function of discarding all ARP packets received from the interface when the rate of ARP packets exceeds the limit on an interface.

However, this command takes effect only on ARP packets sent to the CPU for processing in none-block mode, and does not affect ARP packet forwarding by the chip. In block mode, the device discards subsequent ARP packets on an interface only when the number of ARP packets sent to the CPU exceeds the limit.

Is there a command that can limit the rate of ARP packet forwarding by the chip(switch)? For example, if the gateway is on the aggregation switch (router), how can I limit the rate of ARP packets sent from users to the aggregation device on the access switch?

Thanks.

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Popeye_Wang
Admin Created Sep 16, 2020 09:04:20

Hello,

You can use the lay 2 ACL  to match ARP packets and configure MQC to limit the rate.

For example:

#

acl 4001

 rule permit l2-protocal arp 

#

traffic classifier c1

 if-match acl 4001

#

traffic behavior b1

 car cir 100 pir 100 cbs 18800 pbs 31300 share green pass yellow pass red discard

 traffic policy p1

#

classifier c1 behavior b1

#

 interface gigabitethernet 0/0/1

   traffic-policy p1 inbound

#


However, in this case, the disadvantage is that the policy needs to be applied to the inbound direction of the desired interface. Before configuring the traffic policy,  ensure that no other traffic policy is applied to the interface.

View more
  • x
  • convention：
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(1) (0)
2#
Popeye_Wang
Popeye_Wang Admin Created Sep 16, 2020 09:04:20

Hello,

You can use the lay 2 ACL  to match ARP packets and configure MQC to limit the rate.

For example:

#

acl 4001

 rule permit l2-protocal arp 

#

traffic classifier c1

 if-match acl 4001

#

traffic behavior b1

 car cir 100 pir 100 cbs 18800 pbs 31300 share green pass yellow pass red discard

 traffic policy p1

#

classifier c1 behavior b1

#

 interface gigabitethernet 0/0/1

   traffic-policy p1 inbound

#


However, in this case, the disadvantage is that the policy needs to be applied to the inbound direction of the desired interface. Before configuring the traffic policy,  ensure that no other traffic policy is applied to the interface.

View more
  • x
  • convention：
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