Owner's Manual

Appendix C. Troubleshooting | 831
NETGEAR 8800 User Manual
To display detailed information for each VLAN configured on the switch, use the show
vlan detail
command.
For additional VLAN troubleshooting tips, see VLANs on page 839.
• Your Spanning Tree Protocol (STP) configuration, including the STP domain (STPD)
number, VLAN assignment, and port state.
To display STP information, use the following commands:
• show stpd detail—Displays the STP settings on the switch
• show stpd ports—Displays the STP state of a port
• show vlan stpd—Displays the STP configuration of the ports assigned to a specific
VLAN
For additional STP troubleshooting tips, see STP on page 840.
Layer 3
When troubleshooting Layer 3 issues, verify:
• The IP address assigned to each VLAN router interface.
To display summary information for all of the VLANs configured on the device, use the
show vlan command.
• That IP forwarding is enabled, the routing protocol is globally enabled, and the routing
protocol is enabled for a VLAN.
To display the configuration information for a specific VLAN, use one of the following
commands:
• show ipconfig {ipv4} {vlan <vlan_name>}—IPv4 environment
• show ipconfig ipv6 {vlan <vlan_name> | tunnel <tunnelname>}—IPv6 environment
• Which destination networks are in the routing table and the source of the routing entry.
To display the contents of the routing table or the route origin priority, use one of the
following commands:
• show iproute—IPv4 environment
• show iproute ipv6—IPv6 environment
To display the contents of the routing table only for routes of a specified origin, use one of
the following commands:
• show iproute origin—IPv4 environment
• show iproute ipv6 origin—IPv6 environment
• That the IP Address Resolution Protocol (ARP) table has the correct entries.
Note: The ARP table is applicable only in IPv4 environments.
To display the contents of the IP ARP table, use the show iparp command.