BigIron RX Series Configuration Guide
189
53-1001810-01
Configuring forwarding parameters
7
•
Destination Unreachable messages – If the device receives an IP packet that it cannot deliver
to its destination, the device discards the packet and sends a message back to the device that
sent the packet. The message informs the device that the destination cannot be reached by
the device.
Disabling replies to broadcast ping requests
By default, the device is enabled to respond to broadcast ICMP echo packets, which are ping
requests.
To disable response to broadcast ICMP echo packets (ping requests), enter the following command.
BigIron RX
(config)# no ip icmp echo broadcast-request
Syntax: [no] ip icmp echo broadcast-request
If you need to re-enable response to ping requests, enter the following command.
BigIron RX
(config)# ip icmp echo broadcast-request
Disabling ICMP destination unreachable messages
By default, when the device receives an IP packet that the device cannot deliver, the device sends
an ICMP Unreachable message back to the host that sent the packet. You can selectively disable a
device’s response to the following types of ICMP Unreachable messages:
•
Administration – The packet was dropped by the
Brocade
device due to a filter or ACL
configured on the device.
•
Fragmentation-needed – The packet has the Don’t Fragment bit set in the IP Flag field, but the
device cannot forward the packet without fragmenting it.
•
Host – The destination network or subnet of the packet is directly connected to the device, but
the host specified in the destination IP address of the packet is not on the network.
•
Network – The device cannot reach the network specified in the destination IP address of the
packet.
•
Port – The destination host does not have the destination TCP or UDP port specified in the
packet. In this case, the host sends the ICMP Port Unreachable message to the device, which
in turn sends the message to the host that sent the packet.
•
Protocol – The TCP or UDP protocol on the destination host is not running. This message is
different from the Port Unreachable message, which indicates that the protocol is running on
the host but the requested protocol port is unavailable.
•
Source-route-failure – The device received a source-routed packet but cannot locate the
next-hop IP address indicated in the packet’s Source-Route option.
You can disable the device from sending these types of ICMP messages on an individual basis.
NOTE
Disabling an ICMP unreachable message type does not change the device’s ability to forward
packets. Disabling ICMP unreachable messages prevents the device from generating or forwarding
the unreachable messages.
Summary of Contents for Brocade DCX
Page 40: ...xl BigIron RX Series Configuration Guide 53 1001810 01 ...
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 ...