Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 128)

104 Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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LSP accounting statistics for single-hop LSP routes
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• In the case of a switchover from a primary LSP (multi-hop LSP) to a secondary LSP (single-hop
LSP), the LSP accounting statistics on the secondary LSP are maintained only when the
secondary LSP is a hot-standby. When the secondary LSP in a hot-standby mode is already UP,
the LSP does not go down in a switchover, and the LSP accounting statistics from the primary
LSP are accounted for on the secondary LSP.
Figure 18 depicts a single-hop LSP where a back-to-back connected link exits between the primary
LSP and secondary LSP.
FIGURE 18 Single-hop LSP
In the case of facility bypass LSP failover, statistics for each individual LSPs riding over the bypass
LSP tunnel are collected.
Figure 19 depicts an MPLS domain for single-hop bypass LSP tunnel
where the merge point is not the egress LER. The accounting statistics for the bypass LSP are not
collected. However, the statistics for the individual LSPs riding over the single-hop bypass LSP
tunnel are collected. For example, when there are two protected LSP routes riding over a single-hop
bypass LSP tunnel and the merge point is not the egress LER, the individual statistics for the two
protected LSP routes are collected, and can be displayed using the show mpls statistics lsp
command.
FIGURE 19 Single-hop bypass LSP