S=0 в таблице mpls.0 на Juniper

[2_alex]

Конфиг:

# show logical-systems R4 protocols mpls                                   
static-label-switched-path my-lsp {
   transit 1000515 {
       next-hop 172.40.0.2;
       pop;
   }
}
static-label-switched-path my-lsp2 {
   transit 1000030 {
       next-hop 172.30.0.1;
       swap 1000130;
   }
}
interface lt-1/2/0.42;
interface lt-1/2/0.45;

 

Таблица mpls.0:

# run show route logical-system R4 table mpls.0                            

mpls.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

0                  *[MPLS/0] 00:26:10, metric 1
                     Receive
1                  *[MPLS/0] 00:26:10, metric 1
                     Receive
2                  *[MPLS/0] 00:26:10, metric 1
                     Receive
1000030            *[MPLS/6] 00:09:23, metric 1
                   > to 172.30.0.1 via lt-1/2/0.42, Swap 1000130
1000515            *[MPLS/6] 00:22:33, metric 1
                   > to 172.40.0.2 via lt-1/2/0.45, Pop      
1000515(S=0)       *[MPLS/6] 00:22:33, metric 1
                   > to 172.40.0.2 via lt-1/2/0.45, Pop      

 

В чём смысл записи 1000515(S=0) и чем она отличается от 1000515?

 

# run show route logical-system R4 table mpls.0 label 1000515 extensive    

mpls.0: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
1000515 (1 entry, 1 announced)
TSI:
KRT in-kernel 1000515/52 -> {Pop      }
       *MPLS   Preference: 6
               Next hop type: Router, Next hop index: 1841
               Address: 0x9240250
               Next-hop reference count: 2
               Next hop: 172.40.0.2 via lt-1/2/0.45 weight 0x1, selected
               Label operation: Pop      
               State: <Active Int>
               Age: 23:31 	Metric: 1 
               Task: MPLS
               Announcement bits (1): 1-KRT 
               AS path: I

1000515(S=0) (1 entry, 1 announced)
TSI:
KRT in-kernel 1000515/56 -> {Pop      }
       *MPLS   Preference: 6
               Next hop type: Router, Next hop index: 1842
               Address: 0x9240298
               Next-hop reference count: 2
               Next hop: 172.40.0.2 via lt-1/2/0.45 weight 0x1, selected
               Label operation: Pop      
               State: <Active Int>
               Age: 23:31 	Metric: 1 
               Task: MPLS
               Announcement bits (1): 1-KRT 
               AS path: I

 

Заранее всем спасибо.

[orlik]

http://www.juniper.net/techpubs/en_US/junos10.0/information-products/topic-collections/nog-mpls-model/mpls-layer-verifying.html

 

For each route, the second entry 100864 (S=0) and 100880 (S=0) indicates that the stack depth is not 1, and additional label values are included in the packet.

[2_alex]

orlik

Спасибо!