Juniper JUNOSE 11.2.X BGP AND MPLS, Configuration Manual

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Example
host1(config-router)# network 10.53.42.0 backdoor
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Use the no version to restore the default distance to the EBGP route, 20.
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See network.
Setting the Maximum Number of Equal-Cost Multipaths
You can use the maximum-paths command to specify the number of equal-cost paths
to the same destination that BGP can submit to the IP routing table.
If you set the value to 1, the router installs the single best route in the IP routing table. If
you set the value greater than 1, the router installs that number of parallel routes.
maximum-paths
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Use to set the maximum number of equal-cost multipaths.
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Specify a value in the range 1–16; the default value is 1.
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If you do not specify a keyword, the maximum number applies only to routes learned
from external peers. If you specify the
ibgp keyword, the maximum number applies
only to routes received from internal peers. If you specify the eibgp keyword (valid only
for VRF IPv4 unicast or IPv6 unicast address families), the maximum number applies
to routes received from internal peers and external peers.
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This command takes effect immediately; it does not bounce the session.
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You can specify the maximum number of equal-cost multipaths in the context of the
virtual router, an IPv4 unicast or IPv6 unicast address family, or a VRF specified in the
context of an IPv4 unicast or IPv6 unicast address family.
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This command is not supported for VPNv4 or VPNv6 address families.
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Example 1
host1(config-router)# maximum-paths 3
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Example 2
host1:vr1(config-router-af)# maximum-paths ibgp 5
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Use the no version to restore the default value, 1.
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See maximum-paths.
Detecting Peer Reachability with BFD
You can configure a Bidirectional Forwarding Detection (BFD) session with a BGP neighbor
or peer group to determine relatively quickly whether the neighbor or peer group is
reachable. For more information on BFD, see
JunosE IP Services Configuration Guide . BFD
is supported only for single-hop IBGP and EBGP sessions with either IPv4 or IPv6 neighbors
in the core or within a VRF. BFD is not supported for multi-hop BGP sessions (IBGP
multi-hop or EBGP multi-hop). BFD behavior is identical for IBGP and EBGP single-hop
sessions, and for IPv4 and IPv6 neighbors.
Copyright © 2010, Juniper Networks, Inc. 138
JunosE 11.2.x BGP and MPLS Configuration Guide