Can an S series switch respond to Request packets with broadcast destination addresses

20

An S series switch can respond to ping requests with broadcast destination addresses.
The icmp broadcast-address echo enable command enables a switch to respond to ICMP Echo Request packets with broadcast destination addresses. The undo icmp broadcast-address echo enable command disables a switch from responding to ICMP Echo Request packets with broadcast destination addresses. By default, the function of responding to ICMP Echo Request packets with broadcast destination addresses is enabled.

Other related questions:
Can an S series switches forward a packet if both the source and destination IP addresses of the packet are multicast addresses
The S5710-C-LI or S5700SI drops packets whose source and destination IP addresses are both multicast addresses. Other switches broadcast such packets in a VLAN.

Function of DHCP Request packets on S series switch
For S series switches, DHCP Request messages are sent in the following conditions: - Respond to the DHCP Offer message sent by DHCP servers. - Notify the selected DHCP server using the server identifier option. - Check the allocated network addresses. - Apply for the valid period of addresses. - Extend the existing lease and prolong the lease period.

Prohibit DHCP broadcast packets on S series switch
ACL rules can be configured on S series switches (except S1700 switches) to deny DHCP broadcast packets on specified interfaces. For example, you can deny DHCP broadcast packets on GE0/0/1 as follows: 1. Create advanced ACL 3001 and configure a rule to deny DHCP broadcast packets. [Huawei] acl 3001 [Huawei-acl-adv-3001] rule deny udp destination-port eq 67 source-port eq 68 //Configure an ACL rule to deny DHCP broadcast packets. [Huawei-acl-adv-3001] quit 2. Configure the traffic classifier tc1 to classify packets that match ACL 3001. [Huawei] traffic classifier tc1 [Huawei-classifier-tc1] if-match acl 3001 [Huawei-classifier-tc1] quit 3. Configure the traffic behavior tb1 to deny packets. [Huawei] traffic behavior tb1 [Huawei-behavior-tb1] deny [Huawei-behavior-tb1] quit 4. Define a traffic policy and associate the traffic classifier and traffic behavior with the traffic policy. [Huawei] traffic policy tp1 [Huawei-trafficpolicy-tp1] classifier tc1 behavior tb1 [Huawei-trafficpolicy-tp1] quit 5. Apply the traffic policy to GE0/0/1. [Huawei] interface gigabitethernet 0/0/1 [Huawei-GigabitEthernet0/0/1] traffic-policy tp1 inbound [Huawei-GigabitEthernet0/0/1] quit

How to display the source and destination addresses of forwarded packets on S series switches
For S series switches (except the S1700), no command is available to display the source or destination addresses of the forwarded packets. If you want to obtain the addresses, use a tool to capture packets.

What functions on S series switches can analyze source and destination IP addresses in data packets
NetStream and sFlow supported by S series switches (except S1700 switches) can analyze information about network flows, such as source and destination IP addresses, port numbers, and interfaces in data packets.

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top