Juniper ACX1000 Configuration Manual page 3060

ACX Series Universal Access Router Configuration Guide
Table 216: show route detail Output Fields (continued)
Field Name Field Description
Protocol from which the route was learned and the preference value for the route.
[protocol, preference]
In every routing metric except for the BGP
use common comparison routines, Junos OS stores the 1's complement of the
Preference2
If the
has a higher
Preference2
values. However, Junos OS evaluates
by positive values. Based on the
in the following scenarios:
(IS-IS only). In IS-IS, a single AS can be divided into smaller groups called areas. Routing between
Level
areas is organized hierarchically, allowing a domain to be administratively divided into smaller areas.
This organization is accomplished by configuring Level 1 and Level 2 intermediate systems. Level 1
systems route within an area. When the destination is outside an area, they route toward a Level 2
system. Level 2 intermediate systems route between areas and toward other ASs.
IP subnet augmented with a 64-bit prefix.
Route Distinguisher
Provider multicast service interface (MVPN routing table).
PMSI
3002
—A plus sign indicates the active route, which is the route installed from the routing table into the
+
forwarding table.
—A hyphen indicates the last active route.
-
—An asterisk indicates that the route is both the active and the last active route. An asterisk before
*
a to line indicates the best subpath to the route.
field. For example, if the
value for Route 2 is 155, the
LocalPref
value.
LocalPref
values are signed integers, that is,
Both Signed Preference2 values
Route A = -101
Route B = -156
Where both the Preference2 values are signed, Junos OS evaluates only the unsigned value of
Preference2 and Route A, which has a lower
Unsigned values
Preference2
Now consider both unsigned
Preference2
Route A = 4294967096
Route B = 200
Here, Junos OS considers the lesser
is preferred because it is less than 4294967096.
Combination of signed and unsigned
When values of two routes are compared, and for one route the
Preference2
value, and for the other route it is an unsigned value, Junos OS prefers the route with the positive
value over the negative
Preference2
and unsigned values:
Preference2
Route A = -200
Route B = 200
In this case, Route B with a
Preference2
-200, because Junos OS evaluates only the unsigned value of the
attribute, a lesser value is preferred. In order to
LocalPref
LocalPref value for Route 1 is 100, the
value is -156. Route 2 is preferred because it
Preference2
values can be either positive or negative
Preference2
values as unsigned integers that are represented
Preference2
Preference2 values, Junos OS evaluates a preferred route differently
Preference2 value is preferred.
values:
value and Route B with a
Preference2
values
Preference2
value. For example, consider the following signed
Preference2
value of 200 is preferred although this value is greater than
LocalPref value in the
Preference2 value is -101.
value of 200
Preference2
is a signed
Preference2
value.
Preference2
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