Client Loses Ip Address After A Switch Reboot; Troubleshooting Dynamic Arp Inspection; Enabling Trace Messages For Dynamic Arp Inspection Troubleshooting - Avaya 8800 Troubleshooting Manual

Upper layer troubleshooting
show mlt show ip dhcp snooping interface (ACLI)

Client loses IP address after a switch reboot

In cases where the client loses the IP address after a switch reboot, be aware that the switch
does not maintain the DHCP binding entries after a reboot. Clients normally send DHCP
requests after a switch reboot. DHCP Snooping relies on the client to renew the lease.

Troubleshooting Dynamic ARP Inspection

To troubleshoot specific DAI issues, use the following procedure.
1. If enabling DAI on a DAI untrusted port fails:
2. If ARP packets are not dropped as they should be:
Enabling trace messages for Dynamic ARP Inspection
troubleshooting
You can enable Dynamic ARP Inspection trace for troubleshooting purposes using the
following command:
trace level 117 <1-4> (CLI or ACLI)
456 Troubleshooting
• Verify that DHCP snooping is enabled on that VLAN and that the port is DHCP
untrusted.
show ip dhcp-snooping vlan show ip dhcp-snooping port (CLI)
show ip dhcp snooping vlan show ip dhcp snooping interface
(ACLI)
• Check the DHCP Snooping table, to determine if the IP-to-MAC binding entry
exists.
show ip dhcp-snooping binding (CLI)
show ip dhcp snooping binding (ACLI)
• Check whether the ARP entry belongs to the VLAN on which DAI is enabled.
• If the port is a trunk port, check whether this port belongs to more than 5
VLANs.
show port info vlans (CLI)
show port vlans (ACLI)
Comments? infodev@avaya.com
July 2013