164 BigIron RX Series Configuration Guide53-1001986-01Configuring IP parameters7• GRE Encapsulation• Loopback address for the Tunnel (required for de-encapsulation)• IP address for the TunnelNOTESustained rates of small packet sizes may affect the ability of a 10 gigabit Ethernet port to maintainline rate GRE encapsulation and de-encapsulation performance.Configuring a tunnel interfaceTo configure a tunnel interface, use the following command.BigIron RX(config)# interface tunnel 1BigIron RX(config-tnif-1)Syntax: interface tunnel The variable is numerical value that identifies the tunnel being configured.Configuring a source address for a tunnel interfaceTo configure a source address for a specific tunnel interface, enter the following command.BigIron RX(config)# interface tunnel 1BigIron RX(config-tnif-1)tunnel source 35.0.8.108Syntax: tunnel source >The variable is source IP address being configured for the specified tunnel.Configuring a destination address for a tunnel interfaceTo configure a destination address for a specific tunnel interface, enter the following command.BigIron RX(config)# interface tunnel 1BigIron RX(config-tnif-1)tunnel destination 131.108.5.2Syntax: tunnel destination The variable is destination IP address being configured for the specified tunnel.NOTEEnsure a route to the tunnel destination exist on the tunnel source device. Create a static route ifneeded.Configuring a tunnel interface for GRE encapsulationTo configure a specified tunnel interface for GRE encapsulation, enter the following command.BigIron RX(config)# interface tunnel 1BigIron RX(config-tnif-1)tunnel mode gre ipSyntax: tunnel mode gre ipThe gre parameter specifies that the tunnel will use GRE encapsulationThe Ip parameter specifies that the tunnel protocol is IP.
