User manual

7-2
Cisco Active Network Abstraction 3.6.6 MPLS User Guide
OL-19192-01
Chapter 7 MPLS Network Faults
BGP Neighbor Loss Alarm
BGP Neighbor Loss Alarm
If BGP connectivity is lost to a specific device in an MPLS VPN network, VPN sites lose connectivity.
The VNE models the BGP connection between routers and actively monitors its state. A BGP Neighbor
Loss alarm is generated from both sides of the connection when a connectivity loss occurs. Alarms and
tickets are issued and impact analysis information displayed.
The correlation engine identifies various faults that affect the BGP connection and reports them as the
root cause for the BGP neighbor loss alarm, for example, Link Down, CPU Overutilized, and Link Data
Loss.
Note BGP Neighbor Loss alarms are not correlated to each other. They are correlated to the root cause of the
connectivity loss.
Table 7-1 MPLS Network Alarms Supported by Cisco ANA
Alarm Default Severity Description Up Alarm
BGP Neighbor
Loss
Red (critical) Generated whenever BGP connectivity is
lost to a specific device.
BGP Neighbor
Found
Broken LSP
Discovered
Orange (major) Activates a backward flow on the untagged
entry to traverse the full LSP path passing
through it. The alarm is generated whenever
Cisco ANA locates services (such as VRFs
and pseudowires) on the path that use the
LSPs.
N/A
LDP Neighbor
Down
Orange (major) Generated whenever a TCP connection
failure occurs in LDP path, or the interface
no longer runs MPLS.
LDP Neighbor Up
MPLS Black
Hole Found
Dark blue
(information)
Generated whenever Cisco ANA discovers
an MPLS interface that has at least one
untagged LSP leading to a known PE router.
MPLS Black Hole
Cleared
MPLS TE Tunnel
Down
Orange (major) Generated whenever a TE tunnel’s
operational status changes to down and the
tunnel is not flapping.
MPLS TE Tunnel
Up
MPLS TE Tunnel
Flapping
Orange (major) Generated whenever multiple up and down
alarms are generated during a short time
interval and they are suppressed.
MPLS TE Tunnel
Up or MPLS TE
Tunnel Down
Pseudo Wire (L2
VPN) MPLS
Tunnel Down
Yellow (minor) Generated whenever the pseudowire link
goes down, namely, the pseudowire is
reported as down from both the devices
(based on the status of the tunnel).
Layer 2 Tunnel Up
Tunnel
Reoptimized
Dark Blue
(information)
Generated from a syslog message sent by
the router whenever a tunnel is up and its
route changes but the tunnel continues to
remain up.
N/A