Urpf Troubleshooting; Arp; Introduction To Arp; Arp Configuration Task List - Planet XGS3-42000R User Manual

21.4.4 URPF Troubleshooting

Proper operation of the URPF protocol depends greatly on whether the corresponding URPF rules can be
applied correctly. If after the URPF configuration is done and the function does not meet the expectation:
 Check if the Chassis Switch has been configured with the rules conflicting with URPF (URPF priority is
lower than ACL), the ACL rules will validate if confliction exits.
 Check whether there is a relative route in the FIB table. Only when one is found, can the ACL rules be
distributed to the port.
 Check if the hardware A CL performance is full which lead to the newly generated route can not be
applied with A CL rules.
 If all configurations are normal but URPF still can't operate as expected, please enable the URPF
debug function and use the "show urpf" command and ot her commands which display the rule number
and details to observe whether the created URPF rules are correct, and send the result to the
technology service center.

21.5 ARP

21.5.1 Introduction to ARP

ARP (Address Resolution Protoc ol) is mainly used to resolve IP address to Ethernet MAC address. Chassis
Switch supports both dynamic ARP and static ARP configuration.Furthermore, chassis switch supports the
configuration of proxy ARP for some applications. For instance, when an ARP request is received on the port,
requesting an IP address in the same IP segment of the port but not the same physical network, if the port has
enabled proxy ARP, the port would reply to the ARP with its own MAC address and forward the actual packets
received. Enabling proxy ARP allows machines physically separated but of the same IP segment ignores the
physical separation and communicate via proxy ARP interface as if in the same physical network.

21.5.2 ARP Configuration Task List

ARP Configuration Task List:
1. Configure static ARP
2. Configure proxy ARP
3. Clear dynamic A RP
4. Select hash arithmetic
5. Clear the statistic information of A RP messages
1. Configure static ARP
VLAN Port Mode
arp <ip_address> <mac_address>
{interface [ethernet] <portName>}
no arp <ip_address>
Command Explanation
Configures a static ARP entry; the no
command deletes a ARP entry of the
specified IP address.
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