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Administration of the Avaya G350 Media Gateway - Avaya Support

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Configuring GRE tunneling●A combination <strong>of</strong> static routes via parallel tunnels lead to a situation in which each tunnel isrouting packets via ano<strong>the</strong>r tunnel. For example:<strong>G350</strong>-001(super)# interface tunnel 1<strong>G350</strong>-001(super-if:Tunnel 1)# tunnel source x.x.x.x<strong>G350</strong>-001(super-if:Tunnel 1)# tunnel destination 1.0.0.1Done!<strong>G350</strong>-001(super-if:Tunnel 1)# exit<strong>G350</strong>-001(super)# interface tunnel 2<strong>G350</strong>-001(super-if:Tunnel 2)# tunnel source x.x.x.x<strong>G350</strong>-001(super-if:Tunnel 2)# tunnel destination 2.0.0.1Done!<strong>G350</strong>-001(super-if:Tunnel 2)# exit<strong>G350</strong>-001(super)# interface tunnel 3<strong>G350</strong>-001(super-if:Tunnel 3)# tunnel source x.x.x.x<strong>G350</strong>-001(super-if:Tunnel 3)# tunnel destination 3.0.0.1Done!<strong>G350</strong>-001(super-if:Tunnel 3)# exit<strong>G350</strong>-001(super)# ip route 1.0.0.1 tunnel 2Done!<strong>G350</strong>-001(super)# ip route 2.0.0.1 tunnel 3Done!<strong>G350</strong>-001(super)# ip route 3.0.0.1 tunnel 1Done!Using <strong>the</strong> network shown in Figure 12 as an illustration, if Router 1 has an entry in its routingtable regarding <strong>the</strong> tunnel’s receiving endpoint, this will cause an internal route in which allpackets exiting <strong>the</strong> tunnel will be redirected back into <strong>the</strong> tunnel itself.Figure 12: Nested Tunneling ExampleROUTING TABLE192.68.1.0 255.255.255.0 Tunnel 1Router 1 192.68.1.1 Internet/Intranet 192.68.1.2 Router 2Tunnel 1RouterInterfaceTunnelTunnelInterfaceInterfaceTunnel 1 Tunnel 1RouterInterfaceIssue 3 January 2005 169

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