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DES-7200 Configuration Guide Chapter 1 IP Address and Service
Configuration
1-7
To disable IP routing, execute the following commands in the global
configuration mode:
Command Function
DES-7200(config)# no ip routing
Disable IP routing.
DES-7200(config)# ip routing
Enable IP routing
Note
The switch performs the checking of ip checksum towards the
routing packets. If the ip checksum error occurs, the routing
halts. To this end, the unicast packets will be discarded directly
and the multicast packets will only be forwarded on Layer 2.
1.1.2.4 Handling Broadcast Packets
A broadcast packet is destined for all hosts in a physical network. DES-7200
product supports two kinds of broadcast packets: directed broadcast and
flooding. A directed broadcast packet is sent to all the hosts in a specific
network that the host IDs of their IP addresses are all set to 1. While a flooding
broadcast packet is sent to all the hosts whose IP addresses are all set to 1.
Broadcast packets are heavily used by some protocols, including the Internet
protocol. Therefore, it is the basic responsibility for a network administrator to
manage and control broadcast packets.
Forwarding flooding broadcast packets may make the network overburden and
thus influencing network operation. This is known as broadcast storm. There
are some ways to supress and restrict broadcast storm in the local network.
However, layer 2 network devices like bridges and switches will forward and
propagate broadcast storm.
The best solution to solve the broadcast storm problem is to specify a broadcast
address for each network, that is, directed broadcast. This requires the IP
protocol to use directed broadcast instead of flooding broadcast if possible.
For detailed description about broadcast, refer to RFC 919 and RFC 922.
To handle broadcast packets, perform the following tasks according to the
network requirement.
z Enabling Directed Broadcast-to-Physical Broadcast Translation
z Establishing an IP Broadcast Address
1.1.2.4.1 Enabling Directed Broadcast-to-Physical Broadcast Translation
A directed broadcast IP packet is the one destined to the broadcast address of
an IP subnet. For instance, the packet destined to 172.16.16.255 is a directed