■
Use the
no
version to disable SSM.
■
See ip pim ssm.
Configuring the BFD Protocol for PIM
The
ip 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
ip 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
ip 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.
NOTE:
Before the router can use the
ip pim bfd-liveness-detection
command, you
must specify a BFD license key. To view an already configured license, use the
show
license bfd
command.
For general information about configuring and monitoring the BFD protocol, see
Configuring BFD
in the
JUNOSe IP Services Configuration Guide
.
ip pim bfd-liveness-detection
■
Use to enable BFD (bidirectional forwarding detection) and define BFD values
to more quickly detect PIM data path failures.
■
The neighbors in a PIM network use the configured values to negotiate the actual
transmit intervals for BFD packets.
■
You can use the
minimum-transmit-interval
keyword to specify the interval
at which the local router proposes to transmit BFD control packets to its
neighbors. The default value is 300 milliseconds.
108
■
Configuring the BFD Protocol for PIM
JUNOSe 11.1.x Multicast Routing Configuration Guide
Содержание JUNOSE 11.1.X MULTICAST ROUTING
Страница 6: ...vi...
Страница 8: ...viii JUNOSe 11 1 x Multicast Routing Configuration Guide...
Страница 16: ...xvi List of Figures JUNOSe 11 1 x Multicast Routing Configuration Guide...
Страница 18: ...xviii List of Tables JUNOSe 11 1 x Multicast Routing Configuration Guide...
Страница 24: ...2 Internet Protocol Version 4 JUNOSe 11 1 x Multicast Routing Configuration Guide...
Страница 64: ...42 Investigating Multicast Routes JUNOSe 11 1 x Multicast Routing Configuration Guide...
Страница 100: ...78 Monitoring IGMP Proxy JUNOSe 11 1 x Multicast Routing Configuration Guide...
Страница 145: ...Monitoring PIM 123 Chapter 3 Configuring PIM for IPv4 Multicast...
Страница 146: ...124 Monitoring PIM JUNOSe 11 1 x Multicast Routing Configuration Guide...
Страница 166: ...144 Monitoring DVMRP JUNOSe 11 1 x Multicast Routing Configuration Guide...
Страница 168: ...146 Internet Protocol Version 6 JUNOSe 11 1 x Multicast Routing Configuration Guide...
Страница 204: ...182 BGP Multicast JUNOSe 11 1 x Multicast Routing Configuration Guide...
Страница 263: ...Part 3 Index Index on page 243 Index 241...
Страница 264: ...242 Index JUNOSe 11 1 x Multicast Routing Configuration Guide...