Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - MULTICAST ROUTING CONFIGURATION GUIDE 2010-10-07 Configuration Manual page 246

JunosE 11.3.x Multicast Routing Configuration Guide
ipv6 pim ssm
Configuring the BFD Protocol for PIM
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The no version disables ssm-map:
host1(config)#no ipv6 mld ssm-map static ssm_map1 51::1
Use to enable PIM SSM and define the SSM range of IPv6 multicast addresses.
Example 1—Enables SSM with addresses in the IANA range. The SSM address range
is set as the default, which is limited to the IPv6 address range, and where x represents
any valid scope.
host1(config)#ipv6 pim ssm FF3 x ::/96
Example 2—Configures Class D addresses outside of the default SSM range.
host1(config)#ipv6 access-list alist permit any ff3e::1:0:0/96
host1(config)#ipv6 pim ssm range alist
Example 3—Resets the SSM address range to the default.
host1(config)#ipv6 pim ssm default
Use the no version to disable SSM.
See ipv6 pim ssm.
The ipv6 pim bfd-liveness-detection command configures the Bidirectional Forwarding
Detection (BFD) protocol for PIM. The BFD protocol uses control packets and shorter
detection time limits to more rapidly detect failures in a network. Also, because they are
adjustable, you can modify the BFD timers for more or less aggressive failure detection.
PIM routers send periodic hello messages from each PIM-enabled interface. You can
configure this interval using the ipv6 pim query-interval command. By default, the PIM
router sends a hello message every 30 seconds (with an interval range of 0–210 seconds).
If it receives no response from a neighbor within 3.5 times the interval value (a minimum
of 3.5 seconds), the PIM router drops the neighbor.
In contrast, when a BFD session exists between neighbors, a PIM neighbor that goes
down is detected quickly (in milliseconds rather than in seconds).
When you issue the ipv6 pim bfd-liveness-detection command on a PIM router, the
router establishes BFD liveness detection with all BFD-enabled PIM neighbors. When the
local router receives an update from a remote PIM neighbor—if BFD is enabled and if the
session is not already present—the local router attempts to create a BFD session to the
remote neighbor.
Each adjacent pair of neighbors negotiates an acceptable transmit interval for BFD
packets. The negotiated value can be different on each neighbor. Each neighbor then
calculates a BFD liveness detection interval. When a neighbor does not receive a BFD
packet within the detection interval, it declares the BFD session to be down.
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