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16-Tunneling commands

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Tunneling commands

bandwidth

Use bandwidth to set the expected bandwidth for an interface.

Use undo bandwidth to restore the default.

Syntax

bandwidth bandwidth-value

undo bandwidth

Default

The expected bandwidth (in kbps) is the interface maximum rate divided by 1000.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

bandwidth-value: Specifies the expected bandwidth, in the range of 1 to 400000000 kbps.

Usage guidelines

The expected bandwidth for an interface affects the link costs in OSPF, OSPFv3, and IS-IS. For more information, see Layer 3—IP Routing Configuration Guide.

Examples

# Set the expected bandwidth for Tunnel 1 to 100 kbps.

<Sysname> system-view

[Sysname] interface tunnel 1

[Sysname-Tunnel1] bandwidth 100

default

Use default to restore the default settings for a tunnel interface.

Syntax

default

Views

Tunnel interface view

Predefined user roles

network-admin

Usage guidelines

CAUTION:

The default command might interrupt ongoing network services. Make sure you are fully aware of the impact of this command when you use it on a live network.

This command might fail to restore the default settings for some commands for reasons such as command dependencies or system restrictions. Use the display this command in interface view to identify these commands. Use their undo forms or follow the command reference to restore their default settings. If your restoration attempt still fails, follow the error message instructions to resolve the problem.

Examples

# Restore the default settings of Tunnel 1.

<Sysname> system-view

[Sysname] interface tunnel 1

[Sysname-Tunnel1] default

description

Use description to configure the description of an interface.

Use undo description to restore the default.

Syntax

description text

undo description

Default

The description of a tunnel interface is Tunnelnumber Interface, for example, Tunnel1 Interface.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

text: Specifies a description, a case-sensitive string of 1 to 255 characters.

Usage guidelines

Configure descriptions for different interfaces for identification and management purposes.

You can use the display interface command to display the configured interface description.

Examples

# Configure the description of Tunnel 1 as tunnel1.

<Sysname> system-view

[Sysname] interface tunnel 1

[Sysname-Tunnel1] description tunnel1

Related commands

display interface tunnel

destination

Use destination to specify the destination address for a tunnel interface.

Use undo destination to restore the default.

Syntax

destination { ipv4-address | ipv6-address | dhcp-alloc interface-type interface-number }

undo destination

Default

No tunnel destination address is configured.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

ipv4-address: Specifies the tunnel destination IPv4 address.

ipv6-address: Specifies the tunnel destination IPv6 address.

dhcp-alloc interface-type interface-number: Specifies an interface by its type and number to obtain AFTR's IPv6 address from DHCPv6 packets.

Usage guidelines

For a manual tunnel interface, you must configure the destination address. For an automatic tunnel interface, you do not need to configure the destination address.

The tunnel destination address must be the address of the receiving interface on the tunnel peer. It is used as the destination address of tunneled packets.

The destination address of the local tunnel interface must be the source address of the peer tunnel interface. The source address of the local tunnel interface must be the destination address of the peer tunnel interface.

Do not specify the same tunnel source and destination addresses for the tunnel interfaces on the same device.

For a B4 router to automatically establish a DS-Lite tunnel with an AFTR, configure DHCPv6 client, IPv6 DNS client, and the destination dhcp-alloc command on the B4 router. In addition, make sure a DHCPv6 server and an IPv6 DNS server (for dynamic DNS) exist in the network.

After receiving a DHCPv6 packet from the interface specified by the destination dhcp-alloc command, the B4 router performs the following operations:

1. Obtains the domain name of the AFTR from the packet.

2. Sends a name query to the IPv6 DNS server to obtain the AFTR's IPv6 address.

The server resolves the domain name to the IPv6 address of AFTR.

For more information about DHCPv6 server, DHCPv6 client, and IPv6 DNS, see Layer 3—IP Services Configuration Guide.

Examples

# The interface GigabitEthernet 1/0/1 on Sysname 1 uses the IP address 193.101.1.1 and the interface GigabitEthernet 1/0/1 on Sysname 2 uses the IP address 192.100.1.1. Configure the source address 193.101.1.1 and destination address 192.100.1.1 for the tunnel interface on Sysname 1.

<Sysname1> system-view

[Sysname1] interface tunnel 1 mode gre

[Sysname1-Tunnel1] source 193.101.1.1

[Sysname1-Tunnel1] destination 192.100.1.1

# Configure the source address 192.100.1.1 and destination address 193.101.1.1 for the tunnel interface on Sysname 2.

<Sysname2> system-view

[Sysname2] interface tunnel 1 mode gre

[Sysname2-Tunnel1] source 192.100.1.1

[Sysname2-Tunnel1] destination 193.101.1.1

Related commands

display interface tunnel

interface tunnel

ipv6 address dhcp-alloc

source

display 6rd

Use display 6rd to display 6RD tunnel interface information.

Syntax

display 6rd [ interface tunnel number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

interface tunnel number: Specifies an existing tunnel interface by its number. If you do not specify a 6RD tunnel interface, this command displays information about all existing 6RD tunnel interfaces.

Examples

# Display information about 6RD tunnel interface Tunnel 1.

<Sysname> display 6rd interface tunnel 1

Interface : Tunnel1

Tunnel source : 10.11.12.13

6RD status : Operational

IPv6 prefix : 2001:1000::/32

IPv4 prefix : 10.0.0.0/8

IPv4 suffix : 0.0.0.0/0

BR address : 10.11.12.1

Delegated prefix: 2001:1000:B0C:D00::/56

# Display information about all 6RD tunnel interfaces.

<Sysname> display 6rd

Interface : Tunnel0

Tunnel source : 0.0.0.0

6RD status : Not operational

IPv6 prefix : 2002:1000::/32

Interface : Tunnel1

Tunnel source : 10.11.12.13

6RD status : Operational

IPv6 prefix : 2001:1000::/32

IPv4 prefix : 10.0.0.0/8

IPv4 suffix : 0.0.0.0/0

BR address : 10.11.12.1

Delegated prefix: 2001:1000:B0C:D00::/56

Table 1 Command output

Field	Description
Interface	Tunnel interface.
Tunnel source	Source address of the tunnel. If a source interface is specified for the tunnel interface, this field displays the IP address of the source interface. If no source address or source interface is specified for the tunnel interface, or the specified source interface has no IP address, this field displays 0.0.0.0.
6RD status	6RD configuration status: · Operational—6RD configuration is available. · Not operational—6RD configuration is not available. This field displays Operational when the tunnel source address and 6RD prefix are configured.
IPv6 prefix	6RD prefix and its length. If no 6RD prefix is configured, this field displays Not configured.
IPv4 prefix	IPv4 prefix and its length. If the prefix length is not configured, this field displays 0.0.0.0/0.
IPv4 suffix	IPv4 suffix and its length. If the suffix length is not configured, this field displays 0.0.0.0/0.
BR address	IP address of the BR router. If no BR address is configured, this field displays Not configured.
Delegated prefix	6RD delegated prefix calculated based on the 6RD configuration. This field is empty if the 6RD status is Not operational.

Related commands

tunnel 6rd br

tunnel 6rd ipv4

tunnel 6rd prefix

display 6rd destination

Use display 6rd destination to display a 6RD tunnel destination address.

Syntax

display 6rd destination prefix ipv6-prefix interface tunnel number

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

prefix ipv6-prefix: Specifies a 6RD delegated prefix.

interface tunnel number: Specifies an existing tunnel interface by its number.

Usage guidelines

After this command is executed, the system displays the 6RD tunnel destination address calculated by the specified 6RD delegated prefix and 6RD configuration on the tunnel interface. The 6RD configuration includes the 6RD prefix/prefix length, IPv4 prefix/prefix length, and IPv4 suffix/suffix length.

Examples

# Display the 6RD tunnel destination address calculated by the 6RD delegated prefix 2001:1000:0101:0100:: and 6RD configuration on Tunnel 1.

<Sysname> display 6rd destination prefix 2001:1000:0101:0100:: interface tunnel 1

Interface : Tunnel1

Delegated prefix: 2001:1000:101:100::

Destination : 10.1.1.1

Table 2 Command output

Field	Description
Interface	Tunnel interface.
Delegated prefix	6RD delegated prefix.
Destination	Tunnel destination address.

Related commands

display 6rd prefix

Use display 6rd prefix to display a 6RD delegated prefix.

Syntax

display 6rd prefix destination ipv4-address interface tunnel number

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

destination ipv4-address: Specifies a 6RD tunnel destination address.

interface tunnel number: Specifies an existing tunnel interface by its number.

Usage guidelines

After this command is executed, the system displays the 6RD delegated prefix calculated by the specified 6RD tunnel destination address and 6RD configuration on the tunnel interface. The 6RD configuration includes the 6RD prefix/prefix length, IPv4 prefix/prefix length, and IPv4 suffix/suffix length. The 6RD delegated prefix calculated on the peer tunnel interface must be the same as the 6RD delegated prefix configured on the local device.

Examples

# Display the 6RD delegated prefix calculated by the 6RD tunnel destination address 10.1.1.1 and 6RD configuration on Tunnel 1.

<Sysname> display 6rd prefix destination 10.1.1.1 interface tunnel 1

Interface : Tunnel1

Destination : 10.1.1.1

Delegated Prefix: 2001:1000:101:100::

Table 3 Command output

Field	Description
Interface	Tunnel interface.
Destination	6RD tunnel destination address.
Delegated Prefix	6RD delegated prefix.

Related commands

display 6rd destination

display ds-lite b4 information

Use display ds-lite b4 information to display information about the connected B4 routers on the AFTR, including the IPv6 addresses of the B4 routers, and the assigned tunnel IDs.

Syntax

display ds-lite b4 information

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display information about the connected B4 routers.

<Sysname> display ds-lite b4 information

Slot 0 Cpu 0:

B4 address Tunnel ID Tunnel interface Idle time

1234:5678:1234:5678:abcd:abcd:efff:1234 0x00000023 1 12

2000::100:1 0x80000013 2 13

3000::2 0x00000015 3 2

3001::2 0x00000032 -- --

Total B4 addresses: 4

Slot 1 Cpu 0:

B4 address Tunnel ID Tunnel interface Idle time

1234:5678:1234:5678:abcd:abcd:efff:ffff 0x00000125 1 12

5000::100:1 0x80000010 5 13

Total B4 addresses: 2

Table 4 Command output

Field	Description
B4 address	IPv6 address of the B4 router.
Tunnel ID	Tunnel ID that the IPv6 address of the B4 router maps to.
Tunnel interface	ID of the tunnel interface on the DS-Lite tunnel to which the mapping belongs. When the tunnel to which the mapping belongs is removed or a tunnel with the same ID but different mode is created, this field displays hyphens (--).
Idle time	Remaining time in minutes for the mapping between the IPv6 address of the B4 router and tunnel ID. When the mapping ages out but is still used by a session, this field displays hyphens (--).
Total B4 addresses	Number of IPv6 addresses of the B4 routers.

display interface tunnel

Use display interface tunnel to display tunnel interface information.

Syntax

display interface [ tunnel [ number ] ] [ brief [ description | down ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

tunnel [ number ]: Specifies a tunnel interface. The number argument specifies the tunnel interface number. The specified tunnel interface must have been created. If you do not specify the tunnel keyword, this command displays information about all interfaces except VA interfaces on the device. For information about VA interfaces, see PPPoE in Layer 2—WAN Access Configuration Guide. If you specify the tunnel keyword without the number argument, this command displays information about all existing tunnel interfaces.

brief: Displays brief interface information. If you do not specify this keyword, the command displays detailed interface information.

description: Displays complete interface descriptions. If you do not specify this keyword, the command displays only the first 27 characters of interface descriptions.

down: Displays information about interfaces in the physical state of DOWN and the causes. If you do not specify this keyword, the command displays information about interfaces in all states.

Examples

# Display detailed information about Tunnel 1.

<Sysname> display interface tunnel 1

Tunnel1

Current state: UP

Line protocol state: UP

Description: Tunnel1 Interface

Bandwidth: 64kbps

Maximum transmission unit: 1476

Internet address: 10.1.2.1/24 (primary)

Tunnel source 2002::1:1 (Vlan-interface10), destination 2001::2:1

Tunnel TOS 0xC8, Tunnel TTL 255

Tunnel protocol/transport GRE/IPv6

GRE key disabled

Checksumming of GRE packets disabled

Output queue - Urgent queuing: Size/Length/Discards 0/100/0

Output queue - Protocol queuing: Size/Length/Discards 0/500/0

Output queue - FIFO queuing: Size/Length/Discards 0/75/0

Last clearing of counters: Never

Last 300 seconds input rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Last 300 seconds output rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec

Input: 0 packets, 0 bytes, 0 drops

Output: 0 packets, 0 bytes, 0 drops

Table 5 Command output

Field	Description
Tunnel1	Information about the tunnel interface Tunnel 1.
Current state	Physical link state of the tunnel interface: · Administratively DOWN—The interface has been shut down by using the shutdown command. · DOWN—The interface is administratively up, but its physical state is down (possibly because no physical link exists or the link has failed). · UP—The interface is both administratively and physically up.
Line protocol state	Data link layer state of the interface. The state is determined through automatic parameter negotiation at the data link layer. · UP—The data link layer protocol is up. · UP (spoofing)—The data link layer protocol is up, but the link is an on-demand link or does not exist. This attribute is typical of null interfaces and loopback interfaces. · DOWN—The data link layer protocol is down.
Description	Description of the tunnel interface.
Bandwidth	Expected bandwidth of the tunnel interface.
Maximum transmission unit	MTU of the tunnel interface.
Internet protocol processing: Disabled	The tunnel interface is not assigned an IP address and cannot process IP packets.
Internet address: ip-address/mask-length (Type)	IP address of the interface and type of the address in parentheses. Possible IP address types include: · Primary—Manually configured primary IP address. · Sub—Manually configured secondary IP address. If the interface has both primary and secondary IP addresses, the primary IP address is displayed. If the interface has only secondary IP addresses, the lowest secondary IP address is displayed. · DHCP-Allocated—DHCP allocated IP address. For more information, see DHCP client configuration in Layer 3—IP Services Configuration Guide. · BOOTP-Allocated—BOOTP allocated IP address. For more information, see BOOTP client configuration in Layer 3—IP Services Configuration Guide. · PPP-Negotiated—IP address assigned by a PPP server during PPP negotiation. For more information, see PPP configuration in Layer 2—WAN Access Configuration Guide. · Unnumbered—IP address borrowed from another interface. · Cellular-Allocated—IP address allocated through the modem-manufacturer's proprietary protocol. For more information, see 3G/4G modem management in Layer 2—WAN Access Configuration Guide. · MAD—IP address assigned to an IRF member device for MAD on the interface. For more information, see IRF configuration in Virtual Technologies Configuration Guide. · MTunnel—IP address of the multicast tunnel interface (MTI), which is the same as the IP address of the MVPN source interface. For more information, see multicast VPN configuration in IP Multicast Configuration Guide.
Tunnel source	Source address of the tunnel. If a source interface is specified for the tunnel interface, this field also displays the source interface in parentheses.
destination	Destination address of the tunnel.
Tunnel keepalive enabled, Period(50 s), Retries(3)	GRE keepalive is enabled. In this example, the keepalive interval is 50 seconds and the keepalive number is 3.
Tunnel TOS	ToS of tunneled packets.
Tunnel TTL	TTL of tunneled packets.
Tunnel protocol/transport	Tunnel mode and transport protocol: · CR_LSP—MPLS TE tunnel mode. · GRE/IP—GRE/IPv4 tunnel mode. · GRE/IPv6—GRE/IPv6 tunnel mode. · GRE P2MP—GRE/IPv4 P2MP tunnel mode. · GRE P2MP/IPv6—GRE/IPv6 P2MP tunnel mode. · GRE_ADVPN/IP—GRE-encapsulated IPv4 ADVPN tunnel mode. · GRE_ADVPN/IPv6—GRE-encapsulated IPv6 ADVPN tunnel mode. · UDP_ADVPN/IP—UDP-encapsulated IPv4 ADVPN tunnel mode. · UDP_ADVPN/IPv6—UDP-encapsulated IPv6 ADVPN tunnel mode. · IP/IP—IPv4 over IPv4 tunnel mode. · IPv6—IPv6 tunnel mode. · IPv6/IP—IPv6 over IPv4 manual tunnel mode. · IPv6/IP 6to4—IPv6 over IPv4 6to4 tunnel mode. · IPv6/IP auto-tunnel—Automatic IPv6 over IPv4 tunnel mode. · IPv6/IP ISATAP—IPv6 over IPv4 ISATAP tunnel mode. · DSLITE—DS-Lite tunnel mode on the AFTR. · UDP_VXLAN/IP—UDP-encapsulated IPv4 VXLAN tunnel mode. · NVE/IP—IPv4 NVE tunnel mode.
GRE key disabled	No GRE tunnel interface key is configured.
Checksumming of GRE packets disabled	The GRE packet checksum feature is disabled.
Source port number is 18001	The source port number is 18001 in ADVPN packets sent by the UDP-encapsulated ADVPN tunnel interface.
Output queue - Urgent queuing: Size/Length/Discards 0/100/0	Urgent output queue statistics: Number of packets in the queue/maximum number of packets that the queue can contain/number of packets discarded in the queue.
Output queue - Protocol queuing: Size/Length/Discards 0/500/0	Protocol output queue statistics: Number of packets in the queue/maximum number of packets that the queue can contain/number of packets discarded in the queue.
Output queue - FIFO queuing: Size/Length/Discards 0/75/0	FIFO output queue statistics: Number of packets in the queue/maximum number of packets that the queue can contain/number of packets discarded in the queue. When a CBQ or WFQ queue is configured, this field displays statistics for the CBQ or WFQ queue.
Last clearing of counters	Last time when counters were cleared.
Last 300 seconds input rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec	Average input rate in the last 300 seconds.
Last 300 seconds output rate: 0 bytes/sec, 0 bits/sec, 0 packets/sec	Average output rate in the last 300 seconds.
Input: 0 packets, 0 bytes, 0 drops	Total input packets, total input bytes, and total input packets dropped.
Output: 0 packets, 0 bytes, 0 drops	Total output packets, total output bytes, and total output packets dropped.

# Display brief information about Tunnel 1.

<Sysname> display interface tunnel 1 brief

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Protocol: (s) - spoofing

Interface Link Protocol Primary IP Description

Tun1 UP UP 1.1.1.1 Tunnel1

# Display brief information about Tunnel 1, including the complete interface description.

<Sysname> display interface tunnel 1 brief description

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Protocol: (s) - spoofing

Interface Link Protocol Primary IP Description

Tun1 UP UP 1.1.1.1 Tunnel1

# Display information about interfaces in DOWN state and the causes.

<Sysname> display interface tunnel brief down

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Interface Link Cause

Tun0 DOWN Not connected

Tun1 DOWN Not connected

Table 6 Command output

Field	Description
Interface	Abbreviated interface name.
Link	Physical link state of the interface: · UP—The interface is physically up. · DOWN—The interface is physically down. · ADM—The interface has been shut down by using the shutdown command. To restore the physical state of the interface, use the undo shutdown command. · Stby—The interface is a backup interface in standby state. To see the primary interface, use the display interface-backup state command.
Protocol	Data link layer protocol state of the interface: · UP—The data link layer protocol of the interface is up. · DOWN—The data link layer protocol of the interface is down. · UP(s)—The data link layer protocol of the interface is up, but the link is an on-demand link or does not exist. The (s) attribute represents the spoofing flag. This value is typical of null interfaces and loopback interfaces.
Primary IP	Primary IP address of the interface. This field displays two hyphens (--) if the interface does not have an IP address.
Description	Description of the interface.
Cause	Cause for the physical link state of an interface to be DOWN: · Administratively—The interface has been manually shut down by using the shutdown command. To restore the physical state of the interface, use the undo shutdown command. · Not connected—The tunnel is not established.

Related commands

destination

interface tunnel

source

ds-lite enable

Use ds-lite enable to enable DS-Lite tunneling on an interface.

Use undo ds-lite enable to disable DS-Lite tunneling on an interface.

Syntax

ds-lite enable

undo ds-lite enable

Default

DS-Lite tunneling is disabled on an interface.

Views

Interface view

Predefined user roles

network-admin

Usage guidelines

Use this command on the AFTR's interface connected to the public IPv4 network, so the AFTR can forward IPv4 packets to the B4 router through the DS-Lite tunnel.

You cannot enable DS-Lite tunneling on a DS-Lite tunnel interface on the AFTR.

Examples

# Enable DS-Lite tunneling on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] ds-lite enable

encapsulation-limit

Use encapsulation-limit to set the maximum number of nested encapsulations of a packet allowed on a tunnel interface.

Use undo encapsulation-limit to restore the default.

Syntax

encapsulation-limit number

undo encapsulation-limit

Default

There is no limit to the nested encapsulations of a packet.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

number: Specifies the number of nested encapsulations, in the range of 0 to 10.

Usage guidelines

A packet added with excessive headers becomes oversized. If it exceeds the MTU, it must be fragmented. The fragmentation decreases forwarding rate and increases processing complexity. To avoid this situation, use this command to limit the number of encapsulations.

This command is applicable only to IPv6 over IPv6 tunnels.

Examples

# Set the maximum number of nested encapsulations to 3 on Tunnel 1.

<Sysname> system-view

[Sysname] interface tunnel 1 mode ipv6

[Sysname-Tunnel1] encapsulation-limit 3

Related commands

display interface tunnel

interface tunnel

Use interface tunnel to create a tunnel interface, specify the tunnel mode, and enter tunnel interface view, or enter the view of an existing tunnel interface.

Use undo interface tunnel to delete a tunnel interface.

Syntax

interface tunnel number [ mode { advpn { gre | udp } [ ipv6 ] | ds-lite-aftr | gre [ ipv6 ] | gre-p2mp [ ipv6 ] | ipsec [ ipv6 ] | ipv4-ipv4 | ipv6 | ipv6-ipv4 [ 6rd | 6to4 | auto-tunnel | isatap ] | mgre | mpls-te | nve | vxlan } ]

undo interface tunnel number

Default

No tunnel interfaces exist.

Views

System view

Predefined user roles

network-admin

Parameters

number: Specifies the number of the tunnel interface. The value range is 0 to 10239. The number of tunnel interfaces that can be created is restricted by the total number of interfaces and the memory.

mode advpn gre: Specifies the GRE-encapsulated IPv4 ADVPN tunnel mode.

mode advpn udp: Specifies the UDP-encapsulated IPv4 ADVPN tunnel mode.

mode advpn gre ipv6: Specifies the GRE-encapsulated IPv6 ADVPN tunnel mode.

mode advpn udp ipv6: Specifies the UDP-encapsulated IPv6 ADVPN tunnel mode.

mode ds-lite-aftr: Specifies the DS-Lite tunnel mode on the AFTR.

mode gre: Specifies the GRE/IPv4 tunnel mode.

mode gre ipv6: Specifies the GRE/IPv6 tunnel mode.

mode gre-p2mp: Specifies the GRE/IPv4 P2MP tunnel mode.

mode gre-p2mp ipv6: Specifies the GRE/IPv6 P2MP tunnel mode.

mode ipsec: Specifies the IPsec/IPv4 tunnel mode.

mode ipsec ipv6: Specifies the IPsec/IPv6 tunnel mode.

mode ipv4-ipv4: Specifies the IPv4 over IPv4 tunnel mode.

mode ipv6: Specifies the IPv6 tunnel mode. Set this mode for IPv4 over IPv6 manual tunnels and IPv6 over IPv6 tunnels.

mode ipv6-ipv4: Specifies the IPv6 over IPv4 manual tunnel mode.

mode ipv6-ipv4 6rd: Specifies the 6RD tunnel mode.

mode ipv6-ipv4 6to4: Specifies the 6to4 tunnel mode.

mode ipv6-ipv4 auto-tunnel: Specifies the IPv4-compatible IPv6 automatic tunnel mode.

mode ipv6-ipv4 isatap: Specifies the ISATAP tunnel mode.

mode mgre: Specifies the mGRE tunnel mode.

mode mpls-te: Specifies the MPLS TE tunnel mode.

mode nve: Specifies the NVE tunnel mode.

mode vxlan: Specifies the VXLAN tunnel mode.

Usage guidelines

To create a new tunnel interface, you must specify the tunnel mode in this command. To enter the view of an existing tunnel interface, you do not need to specify the tunnel mode.

A tunnel interface number is locally significant. The tunnel interfaces on the two ends of a tunnel can use the same or different interface numbers.

Examples

# Create GRE/IPv4 tunnel interface Tunnel 1 and enter tunnel interface view.

<Sysname> system-view

[Sysname] interface tunnel 1 mode gre

[Sysname-Tunnel1]

Related commands

destination

display interface tunnel

source

mtu

Use mtu to set the MTU on a tunnel interface.

Use undo mtu to restore the default.

Syntax

mtu size

undo mtu

Default

If the tunnel interface has never been up, the MTU is 64000 bytes.

If the tunnel interface is up, its MTU is identical to the outgoing interface's MTU minus the length of the tunnel headers. The outgoing interface is automatically obtained through routing table lookup based on the tunnel destination address.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

size: Specifies the MTU, in the range of 100 to 64000 bytes.

Usage guidelines

After you configure an MTU for a tunnel interface, the configured MTU applies regardless of the tunnel interface status (up/down) and the outgoing interface MTU.

To avoid fragmentation after tunnel encapsulation, set the tunnel interface MTU no greater than the value of the outgoing interface MTU minus the length of the tunnel headers.

Examples

# Set the MTU on Tunnel 1 to 1000 bytes.

<Sysname> system-view

[Sysname] interface tunnel 1

[Sysname-Tunnel1] mtu 1000

Related commands

display interface tunnel

reset counters interface tunnel

Use reset counters interface tunnel to clear tunnel interface statistics.

Syntax

reset counters interface [ tunnel [ number ] ]

Views

User view

Predefined user roles

network-admin

Parameters

tunnel [ number ]: Specifies a tunnel interface. The number argument specifies the tunnel interface number. If you do not specify the tunnel keyword, this command clears statistics for all interfaces except VA interfaces. If you specify the tunnel keyword without the number argument, this command clears statistics for all tunnel interfaces.

Usage guidelines

Use this command to clear old statistics so you can observe new traffic statistics on a tunnel interface.

Examples

# Clear statistics for Tunnel 1.

<Sysname> reset counters interface tunnel 1

Related commands

display interface tunnel

service

Use service to specify a primary traffic processing slot for a tunnel interface.

Use undo service to restore the default.

Syntax

In standalone mode:

service slot slot-number

undo service slot

In IRF mode:

service chassis chassis-number slot slot-number

undo service chassis

Default

No primary traffic processing slot is specified for a tunnel interface.

Views

Tunnel interface view

Predefined user roles

network-admin

Parameters

slot slot-number: Specifies a card by its slot number. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device. The chassis-number argument represents the member ID of the IRF member device. The slot-number argument represents the slot number of the card. (In IRF mode.)

Usage guidelines

CAUTION:

The following operations might cause a tunnel interface in up state to be down and then up:

· Specifying a primary or backup traffic processing slot for the tunnel interface.

· Rebooting or hot-swapping the primary or backup traffic processing slot of the tunnel interface.

Make sure you understand the potential impact of the operations on your network.

Specify a traffic processing slot if a feature (for example, IPsec antireplay) requires that all traffic on a tunnel interface be processed on the same slot.

For high availability, you can specify one primary and one backup traffic processing slot by using the service command and the service standby command, respectively.

To avoid processing slot switchover, specify the primary slot before specifying the backup slot. If you specify the backup slot before specifying the primary slot, traffic is switched over to the primary slot immediately after you specify the primary slot.

If you specify both primary and backup slots for an interface, traffic on that interface is processed as follows:

· The backup slot takes over when the primary slot becomes unavailable. The backup slot continues to process traffic for the interface after the primary slot becomes available again. The switchover will not occur until the backup slot becomes unavailable.

· When no specified traffic processing slots are available, the traffic is processed on the slot at which it arrives. Then, the processing slot that first becomes available again takes over.

If you do not specify a primary or a backup traffic processing slot for an interface, traffic on that interface is processed on the slot at which the traffic arrives.

Examples

# Specify a primary traffic processing slot for Tunnel 200.

<Sysname> system-view

[Sysname] interface tunnel 200

[Sysname-Tunnel200] service slot 1

Related commands

service standby

Use service standby to specify a backup traffic processing slot for an interface.

Use undo service standby to restore the default.

Syntax

In standalone mode:

service standby slot slot-number

undo service standby slot

In IRF mode:

service standby chassis chassis-number slot slot-number

undo service standby chassis

Default

No backup traffic processing slot is specified for an interface.