If the tunnel interface used by GRE is named in the format of slot ID/subcard ID/interface ID, this command must be run before GRE is bound to the interface using thebinding tunnel grecommand. After the configuration is complete, the tunnel sends packets received from the source tunnel inte...
Pre-configuration Tasks Before configuring a GRE tunnel, complete the following task: Configuring a reachable route between the source and destination interfaces according to Network Interconnection Configuration Guide Configuring the GRE function deteriorates the forwarding performance of the device. Therefore...
Only up to 16 unique source IP addresses are supported for the tunnel source. 2-pass to Single-pass migration, which means converting the same GRE tunnel, is not possible in a single configuration step. You must first delete the 2-pass tunnel and then add the Singl...
The service loopback group then delivers the packet to the forwarding module for Layer 3 forwarding. Before you configure GRE, you must configure a tunnel-type service loopback group on the device. For more information about service loopback groups, seeLayer 2—LAN Switching Configuration Guide....
Configuration The following example shows how to configure GRE tunnel encapsulation: interface tunnel-ip1 ipv4 address 101.0.1.1/24 ipv6 address 101:0:1::1/64 tunnel mode gre ipv4 encap tunnel source [ loopback1 | <any-ipaddres> | any-interface] tunnel destination [ 20....
In this configuration tutorial I will show you how to configure a GRE tunnel between two Cisco IOS routers. One of the routers is located behind a Cisco ASA 5500 Firewall, so I will show you also how to pass GRE traffic through a Cisco ASA as well. As yo
Yes, VPN 3005 concentrator should support GRE tunnels. Here are some configuration examples for the same. Configuring a GRE Tunnel over IPSec with OSPF
The GRE tunnel feature is designed to address the following requirements:A hosting provider must be able to create virtual networks for forwarding without modifying the physical switch configuration. A hosting provider must be able to add subnets to their externally facing networks without modifying ...
The GRE tunnel feature is designed to address the following requirements:A hosting provider must be able to create virtual networks for forwarding without modifying the physical switch configuration. A hosting provider must be able to add subnets to their externally facing networks without modifying ...
GRE tunnels arestateless, meaning the tunnel endpoints (routers) do not keep any information about the receiving router, including its state and availability. As a result, the source router does not have the ability to change the state of the tunnel interface or bring down its line protocol if...