Hitachi GR2000 Series - Manual (Page 198)

Hitachi Gigabit Router GR2000 Series Enhanced Version Operations - Device Management Overview
7-32 GR2K-GA-0015
Ver. 07-02
A packet is discarded due to the defective output destination interface even
when the route in use does not exist (*> is not displayed at the beginning of
the route) during execution of show ip cache policy.
7.5.1.11 Confirmation of Tag-VLAN Setting Information
Even if IP interface information and path information are properly set to this router it
is still possible that communication will not be carried out if packets are discarded
because Tag-VLAN information has been incorrectly set or has not been set at all.
The procedure for confirming this router’s Tag-VLAN setting information is described
below.
Step 1. Log in to this router.
Step 2. Confirm the Tag-VLAN setting information (the existence of VLAN entry
information and the validity of VLAN-ID) using a
show interfaces command.
Step 3. Confirm the Tag-VLAN setting information (VLAN-ID) on an ARP entry using
a
show ip arp command when static ARP is set.
There is no problem in Tag-VLAN setting of this router when it can be confirmed,
using the commands above, that Tag-VLAN is set properly. There may be a problem
in the setting of a connection unit (e.g., LAN switch) when VLAN has not been set or
when VLAN-ID does not coincide). Therefore, confirm the connection unit’s setting
information.
7.5.2 IP addresses cannot be assigned using DHCP function
7.5.2.1 Troubleshooting DHCP/BOOTP Relay Communication Failures
Causes of DHCP/BOOTP relay communication failures may fall in the following
categories:
1. Change in configuration information related to DHCP/BOOTP relay
2. Change in network configuration
3. Failure on DHCP/BOOTP server
Of these, the second category of causes will be resolved by checking the difference
before and after changes of network configuration, and checking whether there is
any cause to prevent communication.
This section assumes that such network configuration is ensured and explains the
other categories of causes. To detect and isolate the failure, follow the flowchart
below in Figure 7-11.