Remote Neighbors And Sham Links; Configuring Ospf Graceful Restart - Juniper IGP - CONFIGURATION GUIDE V11.1.X Configuration Manual

JUNOSe 11.0.x IP, IPv6, and IGP Configuration Guide
update-source

Remote Neighbors and Sham Links

You can configure OSPF remote neighbors to act as sham links for BGP/MPLS VPNs.
See JUNOSe BGP and MPLS Configuration Guide, for more information.

Configuring OSPF Graceful Restart

E Series routers support OSPF graceful restart extensions as defined in RFC 3623
(Graceful OSPF Restart). Graceful restart enables a router to continue forwarding
OSPF traffic based on routing information it receives prior to an unplanned restart,
while the E Series router switches from the primary SRP to the secondary SRP module.
Graceful restart helps to avoid interruptions in traffic forwarding and network-wide
route changes when a route processor restarts or switches over to a redundant route
processor.
To accomplish OSPF graceful restart, communication must take place between the
router that is restarting and its OSPF neighbors. These neighboring routers must
cooperate with (or help) the restarting router by keeping it in the forwarding path
while it is restarting.
The restarting router sends a grace LSA (a link-local LSA) to inform its neighbors that
it is restarting. After receiving this grace LSA, the neighbors act as if the router still
exists in the network topology and continue forwarding traffic through the restarting
router (for the specified grace period as defined in the grace LSA). If the restarting
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Configuring OSPF Graceful Restart
Use to configure a hop count by setting the value of the time-to-live field used
by packets sent to an OSPF remote neighbor.
Specify a value in the range 1–255 seconds; the default value is 1 second.
Example
host1(config-router-rn)#ttl 35
Use the no version to restore the default value, 1 second.
See ttl
Use to specify the loopback interface whose local IP address is used as the source
address for the OSPF connection to a remote neighbor.
We recommend that you do not leave the update source unconfigured for a
remote neighbor.
Example
host1(config-router-rn)#update-source loopback 1
Use the no version to delete the source address from the connection to the
remote neighbor.
See update-source