Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 137)

Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 113
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RSVP IGP synchronization
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6. When an IGP neighbor goes down because of an underlying interface down, MPLS does not
react to an IGP neighbor down event as RSVP would also receive the interface down event and
tears down associated LSPs/sessions. Handling an IGP neighbor down event is redundant in
such situations.
7. When BFD is configured on IGP interfaces, an IGP neighbor down is detected quickly and may
help RSVP converge faster.
8. Bypass LSPs are treated exactly the same way as regular LSPs. Upon an IGP neighbor down,
associated bypass LSPs is torn down.
9. When an IGP neighbor is Nonstop Routing or Graceful Restart (NSR/GR) capable, MPLS does
not receive a neighbor down event when NSR is performed on the peer IGP router.
10. Faster FRR feature is not be triggered when MPLS detects that IGP neighbor is down. Instead,
each FRR LSP is processed individually to perform local repair.
11. It is highly recommended to observe extreme caution when implementing this feature when
BFD is enabled for the underlying IGP. Under some circumstances, unnecessary flapping for
RSVP sessions/LSPs can occur with this combination.
Show command output
The show mpls config and show mpls policy commands displays the configuration used to enable
an IGP neighbor down event handling.
Show mpls config
Brocade(config-mpls-policy)# show mpls config
router mpls
policy
admin-group blue 1
admin-group yellow 2
admin-group red 6
admin-group green 8
traffic-eng isis level-2
handle-isis-neighbor-down
handle-ospf-neighbor-down
no rapid-retry
Show mpls policy
Brocade(config-mpls-policy)# show mpls policy
Current MPLS policy settings:
CSPF interface constraint: enabled
CSPF computation-mode: disabled
TTL propagation for MPLS label: disabled, IPVPN: disabled, IP over MPLS: enabled
Inter-AS route filtering: enabled, Intra-AS iBGP route filtering: disabled
Ingress tunnel accounting: enabled
Polling interval for MPLS LSP traffic statistics: 300 seconds
Advertise TE parameters via: ISIS level-2
Handle neighbor down event - ISIS: Yes OSPF: No
LSP rapid retry: disabled, maximum number of retries: no limit
LSP periodic retry time: 30 seconds
FRR backup/detour retry time: 30 seconds
Admin group:
blue, group number: 1
yellow, group number: 2