display isis ipv6 bfd session

Function

The display isis ipv6 bfd session command displays information about the IPv6 BFD session for IS-IS.

Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this command.

Format

display isis [ process-id | vpn-instance vpn-instance-name ] ipv6 bfd session { all | peer ipv6-address | interface interface-type interface-number }

Parameters

Parameter	Description	Value
process-id	Specifies the ID of an IS-IS process.	The value is an integer ranging from 1 to 65535.
vpn-instance vpn-instance-name	Specifies the name of an IPv6 VPN instance, which is case sensitive.	The value must be an existing VPN instance name.
all	Indicates all the interfaces that run the IS-IS process.	-
peer ipv6-address	Specifies the IPv6 link-local address of a peer.	The prefix is a 32-digit hexadecimal number, in the format of X:X:X:X:X:X:X:X.
interface interface-type interface-number	Specifies the interface whose IPv6 BFD session statistics need to be collected.	-

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

BFD can provide millisecond-level fault detection. It can work with IS-IS to fast detect faults on neighboring devices and instruct IS-IS to recalculate routes for correct packet forwarding. You can run the display isis ipv6 bfd session command to check information about the IPv6 BFD session for IS-IS.

Example

# Display information about the IPv6 BFD session for IS-IS.

<HUAWEI> display isis 1 ipv6 bfd session all

                   IPv6 BFD session information for ISIS(1)
                   -----------------------------------------

Peer System ID : 0000.0000.0002   Type : L2
Interface : GE0/0/1                      
IPv6 BFD State : up       TX : 150   RX : 150   Multiplier : 3   
LocDis : 8195         Local IPv6 Address : FE80::200:13FF:FE82:4569 
RemDis : 8194         Peer  IPv6 Address : FE80::225:9EFF:FEFB:BFF1 
Diag : No diagnostic information

Peer System ID : 0000.0000.0003   Type : L2
Interface : GE0/0/2                      
IPv6 BFD State : up       TX : 150   RX : 150   Multiplier : 3   
LocDis : 8196         Local IPv6 Address : FE80::200:13FF:FE82:4569 
RemDis : 8205         Peer  IPv6 Address : FE80::201:FF:FE01:1 
Diag : No diagnostic information

Total IPv6 BFD session(s): 2

# Display information about the IPv6 BFD session for IS-IS of the peer with the specified IPv6 address.

<HUAWEI> display isis 1 ipv6 bfd session peer FE80::225:9EFF:FEFB:BFF1

                   IPv6 BFD session information for ISIS(1)
                   -----------------------------------------

Peer System ID : 0000.0000.0002   Type : L2
Interface : GE0/0/2                      
IPv6 BFD State : up       TX : 150   RX : 150   Multiplier : 3   
LocDis : 8195         Local IPv6 Address : FE80::200:13FF:FE82:4569 
RemDis : 8194         Peer  IPv6 Address : FE80::225:9EFF:FEFB:BFF1 
Diag : No diagnostic information

Total IPv6 BFD session(s): 1

# Display information about the IPv6 BFD session for IS-IS of the specified interface.

<HUAWEI> display isis 1 ipv6 bfd session interface GigabitEthernet 0/0/2

                   IPv6 BFD session information for ISIS(10)
                   -----------------------------------------

Peer System ID : 0000.0000.0002   Type : L2
Interface : GE0/0/2                      
IPv6 BFD State : up       TX : 150   RX : 150   Multiplier : 3   
LocDis : 8195         Local IPv6 Address : FE80::200:13FF:FE82:4569 
RemDis : 8194         Peer  IPv6 Address : FE80::225:9EFF:FEFB:BFF1 
Diag : No diagnostic information

Total IPv6 BFD session(s): 1

**Table 1** Description of the **display isis ipv6 bfd session** command output
Item	Description
Peer system ID	System ID of the peer
Interface	Local interface name
Type	Level of the peer: L1: Level-1 L2: Level-2 L12: Level-1-2
IPv6 BFD State	IPv6 BFD status: up: indicates that the IPv6 BFD session is established successfully. down: indicates that the IPv6 BFD fails to be established.
TX	Negotiated minimum interval for sending IPv6 BFD packets
RX	Negotiated minimum interval for receiving IPv6 BFD packets
Multiplier	Remote detection multiplier
LocDis	Local identifier dynamically assigned by IPv6 BFD
Local IPv6 Address	IPv6 link-local address
RemDis	Remote identifier dynamically assigned by IPv6 BFD
Peer IPv6 Address	IPv6 link-local address of the peer
Diag	Diagnostic information: No diagnostic information: IPv6 BFD runs properly, and no diagnostic information is displayed. Administrator down: The session is set Down by the network administrator. Global IPv6 BFD is not enabled: Global IPv6 BFD is disabled. IPv6 BFD session number reaches the MAX BFD: The number of IPv6 BFD sessions reaches the upper limit. No IPv6 BFD packets were received: The device does not receive any IPv6 BFD packet. Neighbour is down: The neighbor goes Down. Administrator down event received: The device receives an event indicating that the IPv6 BFD session is set Down by the network administrator.
Total IPv6 BFD session(s)	Total number of IPv6 BFD sessions