What are the functions of tunnel interface IP addresses

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An tunnel interface IP address enables the tunnel interface to become Up and is mandatory. The IP address is not involved in packet encapsulation.
When static routes are used to direct traffic to a GRE tunnel, the IP address of the interfaces at both ends of the tunnel can belong to different network segments. When an GRE tunnel is established for OSPF routing exchange between two networks connected to the tunnel, the IP address of the interfaces at both ends of the tunnel must belong to the same network segment. Otherwise, the tunnel interfaces fail to establish an OSPF adjacency.

Other related questions:
What is the function of the tunnel interface (GRE interface)
The tunnel interface (GRE interface) encapsulates and decapsulates data packets using GRE. The tunnel interface that sends encapsulated packets is called the tunnel source interface, and the one that receives these packets on the peer end is called the tunnel destination interface. Generally, the local WAN interface is used as the tunnel source interface, and the peer WAN interface is used as the tunnel destination interface.

How to implement the function of binding the IP address, MAC address, and interface through configurations
The Switch implements the function of binding the IP address, MAC address, and interface through the DHCP snooping static binding table. To implement the function, configure the static binding table on a VLAN with the IP address and MAC address of the PC being the IP address and MAC address of the static binding table. Then configure the function of checking IP and ARP packets on the interface that connects the PC and Switch. For example, to bind the IP address 10.1.1.1, MAC address 0002-0002-0002, and interface Ethernet 0/0/1, run the following commands: In V100R005 and V100R006, the configuration is as follows: [HUAWEI] dhcp enable [HUAWEI] dhcp snooping enable [HUAWEI] vlan 100 [HUAWEI-vlan100] quit [HUAWEI] interface Ethernet 0/0/1 [HUAWEI-Ethernet0/0/1] port default vlan 100 [HUAWEI-Ethernet0/0/1] ip source check user-bind enable [HUAWEI-Ethernet0/0/1] quit [HUAWEI] vlan 100 [HUAWEI-vlan100] dhcp snooping enable [HUAWEI-vlan100] quit [HUAWEI] user-bind static ip-address 10.1.1.1 mac-address 0002-0002-0002 interface Ethernet0/0/1

Functions of OceanStor 9000 floating IP addresses
OceanStor 9000 provides floating IP addresses for failovers in NFS sharing scenarios. When a node is faulty, the floating IP address automatically moves to the front-end port of a normal node. In this way, user access is not affected.

What is the function of the default multicast address of BFD on an AR
When BFD is used to detect the physical status of a link, you may not specify the remote IP address. In some situations, the remote end such as the Eth-Trunk member link is not assigned an IP address. A BFD session needs to be bound to a multicast IP address and the AR needs to send BFD control packets to the multicast IP address. In the following situations, you must change the default multicast IP address: - On the network, other protocols use the multicast IP address. - Multiple BFD sessions exist on the BFD detection path. For example, when Layer 3 interfaces are connected through Layer 2 switching devices that support BFD, you must configure different default multicast IP addresses for the devices where different BFD sessions are established. You can run the default-ip-address ip-address command to configure the default multicast IP address for the BFD session. [Huawei] bfd [Huawei-bfd] default-ip-address 224.0.0.150 //Set the default multicast address bound to the BFD session to 224.0.0.150.

Whether source address (interface) and destination address (interface) are mandatory when a GRE tunnel is configured on the USG6000
The source address (interface) and destination address (interface) are mandatory when a GRE tunnel is configured.

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