BFD_1.3.6.1.4.1.2011.5.25.38.3.1 hwBfdSessDown

Trap Buffer Description

Session changes to DOWN. (Index=[Index], ConfigurationName=[ConfigurationName], PeerIp=[PeerIp], BindIfIndex=[BindIfIndex], BindIfName=[BindIfName], Diagnosis=[Diagnosis], BindVrfIndex=[BindVrfIndex], BindVpnName=[BindVpnName], SessionType=[SessionType], DefaultIp=[DefaultIp], BindType=[BindType], StaticLspName=[StaticLspName], PwSecondary=[PwSecondary], NextHop=[NextHop], VcId=[VcId], VsiName=[VsiName], VsiPeerAddress=[VsiPeerAddress], DiscrAuto=[DiscrAuto], PeerIpv6=[PeerIpv6], Ipv6NextHop=[Ipv6NextHop])

The BFD session went Down.

Trap Attributes

Trap Attribute	Description
Alarm or Event	Event
Trap Severity	Warning
Mnemonic Code	hwBfdSessDown
Trap OID	1.3.6.1.4.1.2011.5.25.38.3.1
MIB	HUAWEI-BFD-MIB
Alarm ID	This is an event trap and does not involve alarm ID.
Alarm Name	This is an event trap and does not involve alarm name.
Alarm Type	This is an event trap and does not involve alarm type.
Raise or Clear	This is an event trap and does not involve alarm generation or clearance.
Match trap	-

Trap Buffer Parameters

Parameter	Description
Index	Indicates the index of the BFD session.
ConfigurationName	Indicates the configuration name of the BFD session.
PeerIp	Indicates the bound destination IP address.
BindIfIndex	Indicates the index of the bound interface.
BindIfName	Indicates the name of the bound interface.
Diagnosis	Indicates information about session diagnostic characters. 0: No diagnostic word 1: Detection time Down 2: Echo detection Down 3: Neighbor advertisement Down 4: Forwarding plane reset 5: Path Down 6: Cascading path Down 7: Administratively Down 8: Reverse cascading path Down 9: Peer administratively Down 25: IP error code stop 26: IP error code start 27: Section error code stop 28: Section error code start 29: LSP error code stop 30: LSP ingress error code start 31: LSP transit error code start.
BindVrfIndex	Indicates the index of the bound VPN.
BindVpnName	Indicates the name of the bound VPN.
SessionType	1: static, which indicates that the BFD session is statically configured. 2: Dynamic, which indicates that the BFD session is dynamically triggered. 3: Entire_Dynamic: indicates that a BFD session is dynamically triggered. After the function of passively creating a BFD session is enabled on the egress of the LSP, the BFD session is created. 4: Static_Auto: indicates a static BFD session with automatically negotiated discriminators.
DefaultIp	Indicates the default multicast IP address.
BindType	2 or 3: Peer IP address (multi-hop IP link detection). 1 or 4: Interface (single-hop IP link detection). 5: FEC (detection of a specified FEC link). 6: TUNNELIF (detection of a specified tunnel interface link). 7: OSPF (OSPF neighbor link detection). 8: ISIS (ISIS neighbor link detection). 9: LDP_LSP (LDP LSP detection). 10: STATIC_LSP (static LSP detection). 11: TE_LSP (detection of the LSP bound to a TE tunnel). 12: TE_TUNNEL (TE tunnel detection). 13: PW (PW link detection). 14: LSP_PASSIVE (reversed LSP link detection). 15: VSI_PW (VSI PW link detection). 16: LDP_TUNNEL (LDP tunnel detection). 17: VXLAN (VXLAN link detection).
StaticLspName	Indicates the name of the static LSP. This parameter is always displayed as "-".
PwSecondary	Secondary PW flag. 1: primary PW. 2: secondary PW. 3: non-PW link.
NextHop	Indicates the IP address of the next hop.
VcId	Indicates the ID of the VC.
VsiName	Indicates the name of the VSI.
VsiPeerAddress	Indicates the destination address of the VSI.
DiscrAuto	Indicates the static auto-negotiation discriminator.
PeerIpv6	Indicates the bound destination IPv6 address.
Ipv6NextHop	Indicates the next-hop IPv6 address.

VB Parameters

VB OID	VB Name	VB Index
1.3.6.1.4.1.2011.5.25.38.2.3.1.4	hwBfdSessCfgName	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.5	hwBfdSessPeerAddr	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.6	hwBfdSessBindIfIndex	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.7	hwBfdSessBindIfName	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.18	hwBfdSessDiag	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.20	hwBfdSessVrfIndex	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.21	hwBfdSessVPNName	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.22	hwBfdSessType	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.24	hwBfdSessDefaultIp	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.26	hwBfdSessBindType	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.28	hwBfdSessStaticLspName	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.30	hwBfdSessPWSecondaryFlag	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.27	hwBfdSessNextHop	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.32	hwBfdSessVcId	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.33	hwBfdSessVsiName	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.34	hwBfdSessVsiPeerAddr	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.35	hwBfdSessDiscrAuto	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.36	hwBfdSessPeerIpv6Addr	hwBfdSessIndex
1.3.6.1.4.1.2011.5.25.38.2.3.1.38	hwBfdSessIpv6NextHop	hwBfdSessIndex

Impact on the System

After the alarm function is enabled, if a large number of sessions flap, the CPU usage is high. In normal cases, there is no impact.

Possible Causes

Cause 1: The session-bound interface goes down.

Cause 2: The peer BFD session is deleted or shut down.

Cause 3: The link went Down or was congested. Consequently, it failed to forward packets.

Procedure

1. Run the display interface command to check whether the physical status of the interface where the session resides is Up.

If yes, go to Step 2.
If no, go to Step 6.

2. Check whether the session status is automatically restored.

If yes, go to Step 6.
If no, go to Step 3.

3. Run the display bfd session all command to check whether the BFD sessions on both ends are deleted.

If yes, go to Step 6.
If no, go to Step 5.

4. Run the ping ip-address command to check whether the link detected by the BFD session fails to forward packets.

If yes, go to Step 6.
If no, go to Step 5.

5. Collect log and configuration information, and contact technical support personnel.

6. End.