A metric2 value can be assigned to any route in the routing table. The metric2defaults to zero for all protocols except for BGP and MPLS/RSVP.
The metric2 for a BGP route defaults to the value of the IGP's metric to the BGP nexthop for that route.
Metric2 also applies to MPLS LSPs listed in inet.3. When you configure a standby LSP or fast reroute, the standby and/or fast reroute LSPs will appear in the inet.3 routing table along with the primary LSP. All paths for the LSP will have equal values for metric, but differing metric2 values. The active path LSP will have a metric2 of 0, while an inactive primary path will have a value of 1 and an inactive secondary standby path will have a value of 2. Fast reroute LSPs generally will be assigned metric2 values starting at 1,000,000.
chano@PE_1# run show route 130.130.130.0/24 extensive
Static_vpn_Customer.inet.0: 5 destinations, 7 routes (5 active, 0 holddown, 0 hidden)
130.130.130.0/24 (2 entries, 1 announced)
TSI:
KRT in-kernel 130.130.130.0/24 -> {indirect(1048578)}
*BGP Preference: 200/-151
Route Distinguisher: 6619:400
Next hop type: Indirect
Address: 0x9685fd4
Next-hop reference count: 5
Source: 1.1.1.11
Next hop type: Router, Next hop index: 1048577
Next hop: 10.10.9.1 via ge-0/0/3.0, selected
Label operation: Push 299984, Push 299840(top)
Label TTL action: prop-ttl, prop-ttl(top)
Load balance label: Label 299984: None; Label 299840: None;
Session Id: 0x142
Next hop: 10.10.3.1 via ge-0/0/4.0
Label operation: Push 299984, Push 300144(top)
Label TTL action: prop-ttl, prop-ttl(top)
Load balance label: Label 299984: None; Label 300144: None;
Session Id: 0x141
Protocol next hop: 1.1.1.7
Label operation: Push 299984
Label TTL action: prop-ttl
Load balance label: Label 299984: None;
Indirect next hop: 0x96dc110 1048578 INH Session ID: 0x151
State: <Secondary Active Int Ext ProtectionCand>
Local AS: 6619 Peer AS: 6619
Age: 1:28 Metric2: 30
Validation State: unverified
Task: BGP_6619.1.1.1.11+179
Announcement bits (1): 1-KRT
AS path: I (Originator)
Cluster list: 1.1.1.11
Originator ID: 1.1.1.7
Communities: target:6619:400
Import Accepted
VPN Label: 299984
Localpref: 150
Router ID: 1.1.1.11
Primary Routing Table bgp.l3vpn.0
Indirect next hops: 1
Protocol next hop: 1.1.1.7 Metric: 30
Label operation: Push 299984
Label TTL action: prop-ttl
Load balance label: Label 299984: None;
Indirect next hop: 0x96dc110 1048578 INH Session ID: 0x151
Indirect path forwarding next hops: 2
Next hop type: Router
Next hop: 10.10.9.1 via ge-0/0/3.0
Session Id: 0x142
Next hop: 10.10.3.1 via ge-0/0/4.0
Session Id: 0x141
1.1.1.7/32 Originating RIB: inet.3
Metric: 30 Node path count: 1
Forwarding nexthops: 2
Nexthop: 10.10.9.1 via ge-0/0/3.0
[edit]
chano@PE_1# run show route 1.1.1.7
inet.0: 47 destinations, 47 routes (47 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
1.1.1.7/32 *[OSPF/110] 00:01:41, metric 30
to 10.10.9.1 via ge-0/0/3.0
> to 10.10.3.1 via ge-0/0/4.0
inet.3: 11 destinations, 11 routes (11 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
1.1.1.7/32 *[LDP/9] 1w0d 23:54:04, metric 30, tag 0
> to 10.10.9.1 via ge-0/0/3.0, Push 299840
to 10.10.3.1 via ge-0/0/4.0, Push 300144