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CloudEngine 16800, 12800, 9800, 8800, 7800, 6800, and 5800 Series Switches Troubleshooting Guide (V100 and V200)

What Does LPM Mean in Display Command Outputs?

What Does LPM Mean in Display Command Outputs?

A longest prefix match (LPM) table is a type of route forwarding table resource inside a chip. You can run display commands to view abbreviations of entry resources in the chip. For example, the display system forwarding resource service command output contains multiple abbreviations.

<HUAWEI> display system forwarding resource service slot 1  
Current system support forwarding template : {standard|large-mac|large-route} 
Configured forwarding template             : standard                            
---------------------------------------------------------------                 
L2 and L3 Forwarding Resourses:                                                 
Slot  Chip  Service        Resource          Max        Used                    
---------------------------------------------------------------                 
1     0     VNI                            16000        1091                    
1     0                    VSI                          1112                    
1     0     VPN-Instance                    4096         115                    
1     0                    VRF                           115                    
1     0     MAC                            32768        2522                    
1     0                    L2_ENTRY                     2637                    
1     0     ARP                           104000           2                    
1     0                    L3_ENTRY                        2                    
1     0                    LPM                             0                    
1     0                    NHP                             2                    
1     0     ND                             64000           0                    
1     0                    L3_ENTRY                        0                    
1     0                    LPM                             0                    
1     0                    NHP                             0                    
1     0     FIBv4                          32000         173                    
1     0                    LPM                           173                    

......

Table 22-101 describes the abbreviations and their meanings of some entry resources in the chip displayed in the preceding command output.

Table 22-101 Abbreviations of entry resources in the chip

Acronym/Abbreviation

Description

VNI

VXLAN network identifier table.

VSI

Virtual switch instance table.

VPN-Instance

VPN instance table.

VRF

VPN routing and forwarding table.

ND

Neighbor discovery table.

L2_ENTRY

Layer 2 forwarding table.

L3_ENTRY

Layer 3 forwarding table.

LEM

Largest exact match table, which is a route forwarding table.

LPM

Longest prefix match table, which is a route forwarding table.

Ex-LPM

LPM route forwarding table of the card in extended Layer 3 forwarding resource mode.

NHP

Next-hop table.

EEDB

Egress encapsulation database, which is a chip forwarding resource table. EEDB resources need to be applied for when forwarding services are configured on a device.

TCAM

Ternary content addressable memory, which is used to store service entries such as ACL, unicast routing, and multicast routing entries.

FIBv4

IPv4 forwarding table.

FIBv6

IPv6 forwarding table.

UC

Unicast forwarding table.

MC

Multicast forwarding table.