SDH Frame Structure 540Terms 540Multiplexing E1/T1 Channels to Form STM-1 541Calculating E1/T1 Channel Sequence Numbers 541Overhead Byte 542CPOS Interface Application Scenario 543Configuring a CPOS Interface 544Configuring an E1 Channel 545Configuring a T1 Channel 545Displaying and Maintaining CPOS Interfaces 546Troubleshooting CPOS Interfaces 54630 ARP C ONFIGURATIONARP Overview 549ARP Function 549ARP Message Format 549ARP Process 550ARP Mapping Table 551Configuring ARP 552Configuring a Static ARP Entry 552Configuring the Maximum Number of ARP Entries Dynamically Learned on anInterface 552Setting Aging Time for Dynamic ARP Entries 552Enabling the ARP Entry Check 553Enabling the Support for ARP Requests from a Natural Network 553ARP Configuration Example 553Configuring Gratuitous ARP 554Introduction to Gratuitous ARP 554Configuring Gratuitous ARP 554Configuring ARP Source Suppression 555Introduction to ARP Source Suppression 555Configuring ARP Source Suppression 555Configuring Authorized ARP 555Introduction to Authorized ARP 555Configuring Authorized ARP 556Example for Configuring Authorized ARP on a DHCP Server 556Example for Configuring Authorized ARP on a DHCP Relay Agent 557Displaying and Maintaining ARP 55931 P ROXY ARP C ONFIGURATIONProxy ARP Overview 561Enabling Proxy ARP 561Displaying and Maintaining Proxy ARP 562Proxy ARP Configuration Examples 562Proxy ARP Configuration Example 562Local Proxy ARP Configuration Example in Case of Port Isolation 56332 DHCP OVERVIEWIntroduction to DHCP 565
