Huawei Quidway S6500 Series Operation Manual page 114

Operation Manual - Network Protocol
Quidway S6500 Series Ethernet Switches
By default, the TCP finwait timer is 675 seconds, the synwait timer is 75 seconds, and
the receiving/sending buffer size of connection-oriented Socket is 4K bytes.
6.1.2 Configure Whether to Send Special IP Packets to CPU
In IP packet forwarding, redirection packets, TTL timeout packets and route
unreachable packets are often sent to CPU, which will notify the peer end for further
processing upon receiving them. But configuration errors and malicious assaults may
cause CPU overload. In this case, in order to maintain normal system running, it may
be required to use the following commands to configure the corresponding packets not
sent to CPU.
Perform the following configuration in System view.
Table 6-2 Configure whether to send special IP packets to CPU
Configure redirection packets, TTL timeout
packets and route unreachable packets sent
to CPU
Configure redirection packets, TTL timeout
packets and route unreachable packets not
sent to CPU
By default, redirection packets and route unreachable packets are not sent to CPU,
while TTL timeout packets are sent to CPU.
6.1.3 Configure Whether to Forward L3 Broadcast Packets
Broadcast packets include full-net broadcast packets and direct-connected broadcast
packets. The destination IP address of a full-net broadcast packet is all ones
(255.255.255.255) or all zeros. A direct-connected broadcast packet is a packet whose
destination IP address is the network broadcast address of a subnet, but source IP
address is not in the subnet segment. When a switch forwards a packet, it cannot tell
whether the packet is a broadcast packet unless the switch is connected with the
subnet.
If a broadcast packet reaches the destination network after being forwarded by the
switch, the switch will receive the broadcast packet, for the switch also belongs to the
subnet. For the VLAN of the switch isolates the broadcast domain, it will stop
forwarding the packet to the network. Using the following configuration task, the user
can choose to forward the broadcast packet to the network for broadcasting.
Perform the following configuration in System view.
Operation
Huawei Technologies Proprietary
6-2
Chapter 6 IP Performance Configuration
Command
ip { redirects | ttl-expires |
unreachables }
undo ip { redirects | ttl-expires |
unreachables }