Juniper ACX1000 Configuration Manual page 758

ACX Series Universal Access Router Configuration Guide
700
When a PCEP session terminates, the PCC starts two timers without immediately
deleting the PCE-initiated LSPs –
to avoid disruption of services. During this time, an active stateful PCE can acquire
control of the LSPs provisioned by the failed PCE, by sending a create request for the
LSP.
Control over PCE-initiated LSPs reverts to the PCC at the expiration of the
. When the
cleanup timeout
acquired control over the LSP from the failed PCE, the PCC takes local control of the
non-delegated PCE-initiated LSP. Later, when the original or a new active stateful
PCE wishes to acquire control of the locally controlled PCE-initiated LSPs, the PCC
delegates these LSPs to the PCE and the
A PCE may return the delegation of the PCE-initiated LSP to the PCC to allow LSP
transfer between PCEs. This triggers the
The PCC waits for the LSP cleanup timer to expire before removing the non-delegated
PCE-initiated LSPs from the failed PCE.
When the
lsp cleanup timer
LSPs from the failed PCE, the PCC deletes all the LSPs provisioned by the failed PCE.
LSP signaling—On receiving one or more LSP parameters from the main active stateful
3.
PCE, the PCC re-signals the TE LSP based on the PCE provided path. If the PCC fails
to set up the LSP, it notifies the PCE of the setup failure and waits for the main PCE
to provide new parameters for that LSP, and then re-signals it.
When the PCE specifies a path that is incomplete or has loose hops where only the
path endpoints are specified, the PCC does not perform local constraint-based routing
to find out the complete set of hops. Instead, the PCC provides RSVP with the PCE
provided path, as it is, for signaling, and the path gets set up using IGP hop-by-hop
routing.
Considering the topology used in
the partial client-side PCE implementation in the MPLS RSVP-TE enabled network. The
ingress routers A and G are the PCCs that are configured to connect to the external
stateful PCE through a TCP connection.
The PCE has a global view of the bandwidth demand in the network and performs external
path computations after looking up the traffic engineering database. The active stateful
PCE then modifies one or more LSP attributes and sends an update to the PCC. The PCC
uses the parameters it receives from the PCE to re-signal the LSP.
delegation cleanup timeout
delegation cleanup timeout
lsp cleanup timer
lsp cleanup timer
expires, and no other PCE has acquired control over the
Figure 37 on page 695, Figure 39 on page 701
Copyright © 2017, Juniper Networks, Inc.
and
lsp cleanup timer
delegation
expires, and no other PCE has
timer is stopped.
for the PCE-initiated LSP.
illustrates
–