Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 60)

36 Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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RSVP soft preemption
1
Brocade(config-if-e1000-1/8)# show mpls int e1/7
Admin: Up Oper: Up
MTU: 1500 bytes
Maximum BW: 10000000 kbps, maximum reservable BW: 10000000 kbps
Admin group: 0x00000000
Reservable BW [priority] kbps:
[0] 10000000 [1] 10000000 [2] 10000000 [3] 10000000
[4] 10000000 [5] 10000000 [6] 10000000 [7] 10000000
Last sent reservable BW [priority] kbps:
[0] 10000000 [1] 10000000 [2] 10000000 [3] 10000000
[4] 10000000 [5] 10000000 [6] 10000000 [7] 10000000
Soft Preemption under provisioned BW [priority] kbps:
[0] 0 [1] 0 [2] 0 [3] 0
[4] 0 [5] 0 [6] 0 [7] 0
LDP tunnel count: 0
P2MP Capable : Yes
Scalability
With the default value (30 seconds) configured for the soft preemption wait timer, the following
scalability numbers have been collected under the following conditions:
• System was running MPLS with few interfaces enabled with MPLS and OSPF as traffic
engineering
• LSPs were configured on the routers
• Soft preemption was triggered by decreasing the BW on transit router/high priority LSP
• All the routers were soft preemption enabled with default wait timer configuration
• Alternate paths were available for MBB of LSPs impacted
TABLE 3 Maximum soft preempted LSPs
Device Type Maximum soft preempted LSPs
Brocade NetIron XMR (with MP++) 2000
Brocade MLX Series 1000
Brocade NetIron CES 128
Brocade NetIron CER 500
Behavioral impact on changing the wait timer value:
• Timer value 0 means no soft preemption
• Timer value 30 is minimum which can be configured other than 0, for which above data is
applicable
• Timer value >30 config shows better performance in terms of number of LSPs which can get
successfully soft preempted provided other criteria are met for MBB. It is expected to be
almost directly proportional to the amount by which timer value is increased. For example, 60
second is double the number of LSPs/maximum configurable LSPs on device under test. The
user must verify for accuracy.