MPLS Guide MPLS and RSVP-TE
3HE 18686 AAAB TQZZA © 2022 Nokia.
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LSP statistics are not collected on a dynamic or static bypass tunnel. LSP egress
statistics are also not collected if the head-end node is also the penultimate-popping
hop (PHP) node for a single-hop LSP using an implicit null label. However, if any
label is pushed onto the label stack, for example, the Layer 2 or Layer 3 service label,
the egress statistics are counted for the LSP even if the transport MPLS label is not
present.
When a hierarchy of LSPs is in use, statistics collection on the outermost label
corresponding to the tunneling LSP and on the inner labels, corresponding to the
tunneled LSPs, are mutually exclusive. The outermost label takes precedence.
Consequently, when the user enables statistics collection on an RSVP LSP that is
also used for tunneling LDP FECs with the LDP over RSVP shortcut, statistics will be
collected on the RSVP LSP only. No statistics are collected for an LDP FEC tunneled
over this RSVP LSP even if the user enabled statistics collection on the FEC. When
the user disables statistics collection on the RSVP LSP, statistics collection, if
enabled, will be performed on the tunneled LDP FEC.
LSP statistics are not collected on static LSPs. Auto-LSP templates do not support
LSP statistics collection.
3.3.2.2 Configuring RSVP LSP Statistics at Egress LER
At the egress LER, statistics are configured in the ingress data path of a terminating
LSP by entering the LSP name, along with the ingress LER system interface
address, with the config>router>mpls>ingress-statistics>lsp lsp-name sender
ip-address command. Statistics collection is enabled in the ingress data path after
the user executes the no shutdown command in the ingress-statistics context. By
default, this function is in a shutdown state.
The LSP name must correspond to the name configured by the user at the ingress
LER. Statistics cannot be configured if the LSP name contains a colon (:), which is
used as a field separator by the ingress LER for encoding the LSP and path names
into the RSVP Session Name field in the Session_Attribute object.
The no form of the ingress-statistics command disables statistics collection in the
ingress data path and removes the accounting policy association from the RSVP
LSP. Users can choose to disable statistics in the ingress data path while keeping
the accounting policy association of the RSVP LSP with the
config>router>mpls>ingress-statistics>lsp>shutdown command.
The same set of counters are updated for packets received over any path of the LSP.
In the steady state, the counters are updated for packets received over the active
path of the LSP. The active path can be the primary path, one of the secondary paths,
the FRR detour path, or the FRR bypass path when the tail-end node is also the MP.
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