3Com Router 3000 Ethernet FamilyConfiguration Guide Chapter 3 Configuration of GRE3Com Corporation3-9By default, the keepalive function of GRE is disabled; seconds is set to 10 and times to3.3.3 Displaying and Debugging GREUpon the completion of the above configurations, execute the display command in anyview to view their running state and to verify the effect of the configurations. Thedebugging command can be used in user view.Table 3-9 Display and debug GREOperation CommandDisplay operating state of tunnelinterfaces. display interface tunnel numberEnable tunnel information debugging. debugging tunnel3.4 Typical Configuration Examples of GREI. Network requirementsTwo subnets running IP, Group1 and Group2, are interconnected by using GREbetween the routers of 3Com1 and 3Com2.II. Network diagramIPGroup1 Internet IPGroup2Tunnel1/0/0Serial1/0/0192.13.2.1/24Serial2/0/1131.108.5.2/24Ethernet0/0/010.1.1.1/24 Ethernet0/0/010.1.3.1/24Tunnel2/0/0Quidway 1 Quidway 2Figure 3-8 Network diagram of GRE applicationIII. Configuration procedure1) Configure 3Com1:# Configure interface Ethernet 0/0/0.[3Com1] interface ethernet 0/0/0[3Com1-Ethernet0/0/0] ip address 10.1.1.1 255.255.255.0[3Com1-Ethernet0/0/0] quit# Configure interface Serial 0/0/0 (physical interface of tunnel).[3Com1] interface serial 1/0/0[3Com1-Serial1/0/0] ip address 192.13.2.1 255.255.255.0
