3Com 10014299 manual Configure Router a, Fault 2 fail to forward transparent transmission protocol

348CHAPTER 21: CONFIGURING IP APPLICATION

II.Networking Diagram

Figure 129 Configuration example of transparent transmission forwarding protocol

Host

10.110.1.1

Router A

Intermediate

networkTFTP server 202.38.160.2

202.38.160.1

III.Configuration Procedure

1 Configure Router A:

[Router] ip relay protocol udp 69

[Router] interface ethernet 0

[Router-Ethernet0]ip address 10.110.1.1 255.255.0.0

[Router-Ethernet0]ip relay-address 202.38.160.2

Troubleshooting DHCP When DHCP relay or transparent transmission function is abnormal, locate the fault with display command or debugging information. Here are some common faults as examples to illustrate the troubleshooting procedure.

Fault 1: (DHCP client host fails to obtain configuration information.

Troubleshooting: perform as follows.

■Check whether the DHCP server is configured with the address pool of the network segment where the DHCP client host is located.

■Check whether the DHCP relay router and the DHCP server have routes reachable to each other.

■Check whether the DHCP relay router is configured with the correct helper address on the client host interface, and whether multiple helper addresses have caused a collision.

Fault 2: fail to forward transparent transmission protocol.

Troubleshooting: perform as follows.

■Display the current forwarding protocol.

■Display the helper addresses configured for the interface.

■Check whether there is a reachable route between the source and target equipment of transparent transmission.