Rsvp; Ccc And Tcc; Graceful Restart And Layer 2 And Layer 3 Vpns - Juniper EX9200 Features Manual

High Availability Feature Guide for EX9200 Switches

RSVP

CCC and TCC

Related
Documentation

Graceful Restart and Layer 2 and Layer 3 VPNs

70
You can configure LDP graceful restart both in the master instance for the LDP protocol
and for a specific routing instance. You can disable graceful restart at the global level
for all protocols, at the protocol level for LDP only, and for a specific routing instance
only.
RSVP graceful restart enables a router undergoing a restart to inform its adjacent
neighbors of its condition. The restarting router requests a grace period from the neighbor
or peer, which can then cooperate with the restarting router. The restarting router can
still forward MPLS traffic during the restart period; convergence in the network is not
disrupted. The restart is not visible to the rest of the network, and the restarting router is
not removed from the network topology. RSVP graceful restart can be enabled on both
transit routers and ingress routers. It is available for both point-to-point LSPs and
point-to-multipoint LSPs.
CCC and TCC graceful restart enables Layer 2 connections between customer edge (CE)
routers to restart gracefully. These Layer 2 connections are configured with the
or
remote-interface-switch
connections have an implicit dependency on RSVP LSPs, graceful restart for CCC and
TCC uses the RSVP graceful restart capabilities.
RSVP graceful restart must be enabled on the provider edge (PE) routers and provider
(P) routers to enable graceful restart for CCC and TCC. Also, because RSVP is used as
the signaling protocol for signaling label information, the neighboring router must use
helper mode to assist with the RSVP restart procedures.
Graceful Restart Concepts on page 65
Graceful Restart System Requirements on page 73
Configuring Graceful Restart for MPLS-Related Protocols on page 83
Configuring Graceful Restart on page 87
VPN graceful restart uses three types of restart functionality:
BGP graceful restart functionality is used on all PE-to-PE BGP sessions. This affects
1.
sessions carrying any service signaling data for network layer reachability information
(NLRI), for example, an IPv4 VPN or Layer 2 VPN NLRI.
OSPF, IS-IS, LDP, or RSVP graceful restart functionality is used in all core routers.
2.
Routes added by these protocols are used to resolve Layer 2 and Layer 3 VPN NLRI.
Protocol restart functionality is used for any Layer 3 protocol (RIP, OSPF, LDP, and
3.
so on) used between the PE and customer edge (CE) routers. This does not apply to
Layer 2 VPNs because Layer 2 protocols used between the CE and PE routers do not
have graceful restart capabilities.
statements. Because these CCC and TCC
lsp-switch
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