LDP hello interval/holdtime

iosv-1,3にて検証

結論

・初期値interval/holdtime: 5000ms/15s
・連動はしてない
・intervalはピア両ルータでinterval/holdtimeの両方に変更がかかっていないとmpls ldp discovery detailで見たとき変更されない
→下記項目では「両側interval, 両側holdtime」でのみinterval値が変更された
・holdtimeはintervalが変更されていなくても、片方のピアが変更されていなくても独立して設定が反映される
・あくまで実際に設定してみて試しただけであって厳密なinterval/holdtimeの相互関係は知らない

初期状態

iosv-1(config)#do sh mpls ldp discovery 
 Local LDP Identifier:
    1.1.1.1:0
    Discovery Sources:
    Interfaces:
        GigabitEthernet0/3 (ldp): xmit/recv
            LDP Id: 3.3.3.3:0; no host route
iosv-1(config)#do sh mpls ldp discovery detail
 Local LDP Identifier:
    1.1.1.1:0
    Discovery Sources:
    Interfaces:
        GigabitEthernet0/3 (ldp): xmit/recv
            Enabled: IGP config;
            Hello interval: 5000 ms; Transport IP addr: 1.1.1.1 
            LDP Id: 3.3.3.3:0; no host route to transport addr
              Src IP addr: 13.1.1.3; Transport IP addr: 3.3.3.3
              Hold time: 15 sec; Proposed local/peer: 15/15 sec
              Reachable via 3.0.0.0/8
              Password: not required, none, in use
            Clients: IPv4

片側interval

iosv-1(config)#mpls ldp discovery hello interval 30

iosv-1(config)#do sh mpls ldp discovery detail
 Local LDP Identifier:
    1.1.1.1:0
    Discovery Sources:
    Interfaces:
        GigabitEthernet0/3 (ldp): xmit/recv
            Enabled: IGP config;
            Hello interval: 5000 ms; Transport IP addr: 1.1.1.1 
            LDP Id: 3.3.3.3:0; no host route to transport addr
              Src IP addr: 13.1.1.3; Transport IP addr: 3.3.3.3
              Hold time: 15 sec; Proposed local/peer: 15/15 sec
              Reachable via 3.0.0.0/8
              Password: not required, none, in use
            Clients: IPv4

両側interval

iosv-3(config)#mpls ldp discovery hello interval 30

iosv-1(config)#do sh mpls ldp discovery detail
 Local LDP Identifier:
    1.1.1.1:0
    Discovery Sources:
    Interfaces:
        GigabitEthernet0/3 (ldp): xmit/recv
            Enabled: IGP config;
            Hello interval: 5000 ms; Transport IP addr: 1.1.1.1 
            LDP Id: 3.3.3.3:0; no host route to transport addr
              Src IP addr: 13.1.1.3; Transport IP addr: 3.3.3.3
              Hold time: 15 sec; Proposed local/peer: 15/15 sec
              Reachable via 3.0.0.0/8
              Password: not required, none, in use
            Clients: IPv4

両側interval, 片側holdtime

iosv-1(config)#mpls ldp discovery hello holdtime 90

iosv-1(config)#do sh mpls ldp discovery detail
 Local LDP Identifier:
    1.1.1.1:0
    Discovery Sources:
    Interfaces:
        GigabitEthernet0/3 (ldp): xmit/recv
            Enabled: IGP config;
            Hello interval: 5000 ms; Transport IP addr: 1.1.1.1 
            LDP Id: 3.3.3.3:0; no host route to transport addr
              Src IP addr: 13.1.1.3; Transport IP addr: 3.3.3.3
              Hold time: 15 sec; Proposed local/peer: 90/15 sec
              Reachable via 3.0.0.0/8
              Password: not required, none, in use
            Clients: IPv4

両側interval, 片側holdtime

iosv-3(config)#mpls ldp disco hello holdtime 90

iosv-1(config)#do sh mpls ldp discovery detail
 Local LDP Identifier:
    1.1.1.1:0
    Discovery Sources:
    Interfaces:
        GigabitEthernet0/3 (ldp): xmit/recv
            Enabled: IGP config;
            Hello interval: 30000 ms; Transport IP addr: 1.1.1.1 
            LDP Id: 3.3.3.3:0; no host route to transport addr
              Src IP addr: 13.1.1.3; Transport IP addr: 3.3.3.3
              Hold time: 90 sec; Proposed local/peer: 90/90 sec
              Reachable via 3.0.0.0/8
              Password: not required, none, in use
            Clients: IPv4

両側holdtime

iosv-1(config)#no mpls ldp disco hello int 30 
iosv-3(config)#no mpls ldp disco hello int 30

iosv-1(config)#do sh mpls ldp disco detail
 Local LDP Identifier:
    1.1.1.1:0
    Discovery Sources:
    Interfaces:
        GigabitEthernet0/3 (ldp): xmit/recv
            Enabled: IGP config;
            Hello interval: 5000 ms; Transport IP addr: 1.1.1.1 
            LDP Id: 3.3.3.3:0; no host route to transport addr
              Src IP addr: 13.1.1.3; Transport IP addr: 3.3.3.3
              Hold time: 90 sec; Proposed local/peer: 90/90 sec
              Reachable via 3.0.0.0/8
              Password: not required, none, in use
            Clients: IPv4

片側holdtime

iosv-1(config)#do sh mpls ldp disco detail
 Local LDP Identifier:
    1.1.1.1:0
    Discovery Sources:
    Interfaces:
        GigabitEthernet0/3 (ldp): xmit/recv
            Enabled: IGP config;
            Hello interval: 5000 ms; Transport IP addr: 1.1.1.1 
            LDP Id: 3.3.3.3:0; no host route to transport addr
              Src IP addr: 13.1.1.3; Transport IP addr: 3.3.3.3
              Hold time: 15 sec; Proposed local/peer: 90/15 sec
              Reachable via 3.0.0.0/8
              Password: not required, none, in use
            Clients: IPv4

参考

CCIE Enterprise Infrastructure Foundation, 2nd Edition