- Table of Contents
-
- 13-Layer 3—IP Services Command Reference
- 00-Preface
- 01-IP addressing commands
- 02-IP forwarding basics commands
- 03-Fast forwarding commands
- 04-ARP commands
- 05-IPv6 basics commands
- 06-IPv6 fast forwarding commands
- 07-DHCP commands
- 08-DHCPv6 commands
- 09-DNS commands
- 10-IP performance optimization commands
- 11-Multi-CPU packet distribution commands
- 12-Adjacency table commands
- Related Documents
-
Title | Size | Download |
---|---|---|
02-IP forwarding basics commands | 68.42 KB |
Basic IP forwarding commands
display fib
Use display fib to display FIB entries.
Syntax
display fib [ vpn-instance vpn-instance-name ] [ ip-address [ mask | mask-length ] ]
Views
Any view
Predefined user roles
network-admin
network-operator
context-admin
context-operator
Parameters
vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To display the FIB entries for the public network, do not specify any VPN instance.
ip-address: Displays the FIB entry that matches the specified destination IP address.
mask: Specifies the mask for the IP address.
mask-length: Specifies the mask length for the IP address. The value range is 0 to 32.
Usage guidelines
If you specify an IP address without a mask or mask length, this command displays the longest matching FIB entry.
If you specify an IP address and a mask or mask length, this command displays the exactly matching FIB entry.
Examples
# Display all FIB entries of the public network.
<Sysname> display fib
Destination count: 5 FIB entry count: 5
Flag:
U:Useable G:Gateway H:Host B:Blackhole D:Dynamic S:Static
R:Relay F:FRR
Destination/Mask Nexthop Flag OutInterface/Token Label
0.0.0.0/32 127.0.0.1 UH InLoop0 Null
192.168.100.0/24 192.168.100.96 U GE1/0/0 Null
127.0.0.0/8 127.0.0.1 U InLoop0 Null
127.0.0.0/32 127.0.0.1 UH InLoop0 Null
127.0.0.1/32 127.0.0.1 UH InLoop0 Null
# Display the FIB entries for VPN vpn1.
<Sysname> display fib vpn-instance vpn1
Destination count: 6 FIB entry count: 6
Flag:
U:Useable G:Gateway H:Host B:Blackhole D:Dynamic S:Static
R:Relay F:FRR
Destination/Mask Nexthop Flag OutInterface/Token Label
0.0.0.0/32 127.0.0.1 UH InLoop0 Null
20.20.20.0/24 20.20.20.25 U GE1/0/0 Null
20.20.20.0/32 20.20.20.25 UBH GE1/0/0 Null
20.20.20.25/32 127.0.0.1 UH InLoop0 Null
20.20.20.25/32 20.20.20.25 H GE1/0/0 Null
20.20.20.255/32 20.20.20.25 UBH GE1/0/0 Null
# Display the FIB entries matching the destination IP address 10.2.1.1.
<Sysname> display fib 10.2.1.1
Destination count: 1 FIB entry count: 1
Flag:
U:Useable G:Gateway H:Host B:Blackhole D:Dynamic S:Static
R:Relay F:FRR
Destination/Mask Nexthop Flag OutInterface/Token Label
10.2.1.1/32 127.0.0.1 UH InLoop0 Null
Table 1 Command output
Field |
Description |
Destination count |
Total number of destination addresses. |
FIB entry count |
Total number of FIB entries. |
Destination/Mask |
Destination address and the mask length. |
Nexthop |
Next hop address. |
Flag |
Flags of routes: · U—Usable route. · G—Gateway route. · H—Host route. · B—Blackhole route. · D—Dynamic route. · S—Static route. · R—Relay route. · F—Fast reroute. |
OutInterface/Token |
Output interface/LSP index number. |
Label |
Inner label. |
inner-interface learn arp-nd
Use inner-interface learn arp-nd to enable ARP and ND entry learning on inner interfaces
Use undo inner-interface learn arp-nd to disable ARP and ND entry learning on inner interfaces.
Syntax
inner-interface learn arp-nd vlan vlan-id
undo inner-interface learn arp-nd
Default
ARP and ND entry learning is disabled on inner interfaces.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
vlan vlan-id: Specifies a VLAN by its ID in the range of 2 to 4094. The specified VLAN must be a VLAN terminated on an inner subinterface and cannot be the default VLAN ID of the peer inner interface.
Usage guidelines
You must enable this feature if NetStream statistics are sent out by inner interfaces. Otherwise, inner interfaces cannot learn ARP or ND entries and fail to transmit NetStream statistics.
This command is supported only on the default context.
Examples
# Enable inner interfaces to learn ARP and ND entries in VLAN 200.
<Sysname> system-view
[Sysname] inner-interface learn arp-nd vlan 200
last-hop backup enable
Use last-hop backup enable to enable last hop backup.
Use undo last-hop backup enable to disable last hop backup.
Syntax
last-hop backup enable
undo last-hop backup enable
Default
Last hop backup is enabled.
Views
System view
Predefined user roles
network-admin
context-admin
Usage guidelines
This feature enables the system to transmit the forward flow and reverse flow between the local node and a peer node over the same path.
In an IRF fabric enabled with this feature, the IRF master device performs the following operations when receiving the first IP packet of a forward flow on an interface enabled with last hop holding:
1. Saves the last hop information of the packet.
2. Synchronizes the last hop information to subordinate devices in the IRF fabric.
The last hop information can be used for guiding the backward flow when the flow arrives at the master device or is forwarded through a subordinate device.
For this feature to take effect in an IRF fabirc, you must also enable session synchronization by using the session synchronization enable command. For more information about the session synchronization enable command, see Security Command Reference.
This feature is also applicable to multi-module devices enabled with service backup. If this feature is enabled on such a device, a device module performs the following operations when receiving the first IP packet of a forward flow on an interface enabled with last hop holding:
1. Saves the last hop information of the packet.
2. Synchronizes the last hop information to other modules in the device.
The last hop information can be used for guiding the backward flow when the flow arrives at one of these modules.
For this feature to take effect on a multi-module device, you must also enable session flow redirection by using the session flow-redirect enable command. For more information about the session flow-redirect enable command, see Security Command Reference.
Examples
# Disable last hop backup.
<Sysname> system-view
[Sysname] undo last-hop backup enable
Related commands
ip last-hop hold
session flow-redirect enable (Security Command Reference)
session synchronization enable (Security Command Reference)
Load sharing commands
ip load-sharing local-first enable
Use ip load-sharing local-first enable to enable local-first load sharing.
Use undo ip load-sharing local-first enable to disable local-first load sharing.
Syntax
ip load-sharing local-first enable
undo ip load-sharing local-first enable
Default
Local-first load sharing is disabled.
Views
System view
Predefined user roles
network-admin
context-admin
Usage guidelines
Local-first load sharing takes effect only on an IRF fabric.
Examples
# Enable local-first load sharing.
<Sysname> system-view
[Sysname] ip load-sharing local-first enable
ip load-sharing mode
Use ip load-sharing mode to configure the load sharing mode.
Use undo ip load-sharing mode to restore the default.
Syntax
ip load-sharing mode { per-flow [ dest-ip | dest-port | ip-pro | src-ip | src-port ] * | per-packet } { global | slot slot-number }
undo ip load-sharing mode { global | slot slot-number }
The following compatibility matrixes show the support of hardware platforms for this command:
F1000 series |
Models |
Command compatibility |
F1000-X-G5 series |
F1000-A-G5, F1000-C-G5, F1000-C-G5-LI, F1000-E-G5, F1000-H-G5, F1000-S-G5 |
Yes |
F1000-X-G3 series |
F1000-A-G3, F1000-C-G3, F1000-E-G3, F1000-S-G3 |
Yes |
F1000-X-G2 series |
F1000-A-G2, F1000-C-G2, F1000-E-G2, F1000-S-G2 |
Yes |
F1000-9X0-AI series |
F1000-9390-AI, F1000-9385-AI, F1000-9380-AI, F1000-9370-AI, F1000-9360-AI, F1000-9350-AI, F1000-990-AI, F1000-980-AI, F1000-970-AI, F1000-960-AI, F1000-950-AI, F1000-930-AI, F1000-920-AI |
Yes |
F1000-9330-AI, F1000-9320-AI, F1000-910-AI, F1000-905-AI |
No |
|
F1000-C83X0 series |
F1000-C8395, F1000-C8390, F1000-C8385, F1000-C8380, F1000-C8370, F1000-C8360, F1000-C8350 |
Yes |
F1000-C8330 |
No |
|
F1000-C81X0 series |
F1000-C8180, F1000-C8170, F1000-C8160 |
Yes |
F1000-C8150, F1000-C8130, F1000-C8120, F1000-C8110 |
No |
|
F1000-7X0-HI series |
F1000-770-HI, F1000-750-HI, F1000-740-HI |
Yes |
F1000-730-HI, F1000-720-HI, F1000-710-HI |
No |
|
F1000-C-X series |
F1000-C-EI, F1000-C-HI, F1000-C-XI, F1000-E-XI |
Yes |
F1000-V series |
F1000-E-VG |
Yes |
F1000-S-VG |
No |
|
SecBlade IV series |
LSPM6FWD8, LSQM2FWDSC8 |
Yes |
F100 series |
Models |
Command compatibility |
F100-X-G5 series |
F100-A-G5, F100-C-G5, F100-M-G5, F100-S-G5 |
No |
F100-E-G5 |
Yes |
|
F100-X-G3 series |
F100-A-G3, F100-E-G3 |
Yes |
F100-C-G3, F100-M-G3, F100-S-G3 |
No |
|
F100-X-G2 series |
F100-A-G2, F100-E-G2 |
Yes |
F100-C-G2, F100-M-G2, F100-S-G2 |
No |
|
F100-WiNet series |
F100-A80-WiNet, F100-A91-WiNet |
Yes |
F100-C80-WiNet, F100-C60-WiNet, F100-C50-WiNet, F100-S80-WiNet, F100-A81-WiNet |
No |
|
F100-C-A series |
F100-C-A6, F100-C-A5, F100-C-A3, F100-C-A6-WL, F100-C-A5-W, F100-C-A3-W |
No |
F100-X-XI series |
F100-A-EI, F100-A-HI, F100-A-SI, F100-E-EI |
Yes |
F100-C-EI, F100-C-HI, F100-C-XI, F100-S-HI, F100-S-XI |
No |
Default
The device performs per-flow load sharing.
Views
System view
Predefined user roles
network-admin
context-admin
Parameters
per-flow: Implements per-flow load sharing.
dest-ip: Identifies flows by destination IP address.
dest-port: Identifies flows by destination port.
ip-pro: Identifies flows by protocol number.
src-ip: Identifies flows by source IP address.
src-port: Identifies flows by source port.
global: Configures the load sharing mode globally.
per-packet: Implements per-packet load sharing.
slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command configures the load sharing mode for all member devices.
Usage guidelines
The per-packet load sharing mode does not take effect in fast forwarding.
Examples
# Configure per-flow load sharing for slot 1.
<Sysname> system-view
[Sysname] ip load-sharing mode per-flow slot 1