BigIron RX Series Configuration Guide
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53-1001810-01
Configuring ARP parameters
7
Applying a rate limit to ARP packets on an interface
To prevent the CPU from becoming flooded by ARP packets in a busy network, you can restrict the
number of ARP packets an interface will accept each second. When ARP rate limit is configured on
an interface, the interface will accept up to the maximum number of packets you specify, but drops
additional ARP packets received during the one-second interval. When a new one-second interval
starts, the counter restarts at zero, so the interface again accepts up to the maximum number of
ARP packets you specified, but drops additional packets received within the interval. This feature is
disabled by default.
Configuration notes
•
When configuring ARP rate limiting globally, interfcae level ARP rate-limiting gets removed.
•
The interface level configuration overrides the global configuration for a specific port.
•
The command is supported on Layer 3 Switches only.
•
There is no default value for <rate>. Enter 0–30,000.
•
If the value of <rate> is entered as 0, the interface will stop processing ARP packets
immediately.
•
You can go to interface trunk mode to configure the ARP port rate limit. When configured over
trunk interface (i.e. on the lead port) the same limit will be configured on each and every port
in the trunk.
•
ARP rate limiting is only supported on physical interfaces (virtual interfaces (ve) are not
supported).
Setting the rate limit to ARP packets on an interface
You can limit the number of ARP packets the device will accept each second by entering the
arp-port-rate-limit command. However, if you want to apply a limit on the rate that ARP packets flow
on an interface of a Layer 3 Switch, enter a command such as the following.
BigIron RX
(config)#interface ethernet 1/4
BigIron RX
(config-vif-10)#arp-port-rate-limit 2000
Syntax: [no] arp-port-rate-limit
<rate>
There is no default value for
<rate>
. Enter 0–30,000.
Displaying the rate limit for ARP packets
To determine how many ARP packets were dropped by an interface due to the configured rate limit
for ARP packets, enter a command such as the following.
LP-1#show ip traffic arp
ARP Statistics
1400 total recv, 1400 req recv, 0 req sent
0 pending drop, 0 invalid source, 0 invalid dest
ARP Rate Limiting Statistics
Interface Received Processed Dropped(Rate-limted)
ethernet1/1 184200 700
183500
ethernet1/2 0 0 0
ethernet1/3 0 0 0
ethernet1/4 184200 700
183500
Summary of Contents for Brocade DCX
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Page 72: ...lxxii BigIron RX Series Configuration Guide 53 1001810 01 ...
Page 88: ...16 BigIron RX Series Configuration Guide 53 1001810 01 Searching and filtering output 1 ...
Page 300: ...228 BigIron RX Series Configuration Guide 53 1001810 01 Displaying IP information 7 ...
Page 318: ...246 BigIron RX Series Configuration Guide 53 1001810 01 Deploying a LAG 8 ...
Page 418: ...346 BigIron RX Series Configuration Guide 53 1001810 01 SuperSpan 12 ...
Page 482: ...410 BigIron RX Series Configuration Guide 53 1001810 01 MRP CLI example 14 ...
Page 506: ...434 BigIron RX Series Configuration Guide 53 1001810 01 Displaying VSRP information 15 ...
Page 582: ...510 BigIron RX Series Configuration Guide 53 1001810 01 Viewing Layer 2 ACLs 20 ...
Page 634: ...562 BigIron RX Series Configuration Guide 53 1001810 01 Troubleshooting ACLs 21 ...
Page 642: ...570 BigIron RX Series Configuration Guide 53 1001810 01 Trunk formation 22 ...
Page 746: ...674 BigIron RX Series Configuration Guide 53 1001810 01 Displaying RIP filters 24 ...
Page 808: ...736 BigIron RX Series Configuration Guide 53 1001810 01 Displaying OSPF information 25 ...
Page 938: ...866 BigIron RX Series Configuration Guide 53 1001810 01 Displaying MBGP information 27 ...
Page 950: ...878 BigIron RX Series Configuration Guide 53 1001810 01 Using secure copy 28 ...
Page 988: ...916 BigIron RX Series Configuration Guide 53 1001810 01 Clearing IS IS information 29 ...
Page 1054: ...982 BigIron RX Series Configuration Guide 53 1001810 01 Sample 802 1x configurations 33 ...
Page 1108: ...1036 BigIron RX Series Configuration Guide 53 1001810 01 sFlow 39 ...
Page 1190: ...1118 BigIron RX Series Configuration Guide 53 1001810 01 Displaying RIPng information 44 ...
Page 1270: ...1198 BigIron RX Series Configuration Guide 53 1001810 01 Displaying ACLs 47 ...
Page 1310: ...1238 BigIron RX Series Configuration Guide 53 1001810 01 Displaying OSPFv3 information 48 ...
Page 1382: ...1310 BigIron RX Series Configuration Guide 53 1001810 01 Commands That Require a Reload D ...
Page 1435: ...BigIron RX Series Configuration Guide 1363 53 1001810 01 VSRP E ...
Page 1436: ...1364 BigIron RX Series Configuration Guide 53 1001810 01 VSRP E ...