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Administrative Weight

Picture
Administrative weight is analogous to the IGP cost(OSPF), metric(IS-IS) or delay(EIGRP) depending on the IGP used. Here we went to CSR3 an added an administrative weight of 100 to change the path selection to forward traffic through XR9

CSR1#show mpls traffic-eng tunnels tunnel 100 

Name: CSR1_t100                           (Tunnel100) Destination: 192.0.2.13
  Status:
    Admin: up         Oper: up     Path: valid       Signalling: connected
    path option 100, type dynamic (Basis for Setup, path weight 40)

  Config Parameters:
    Bandwidth: 0        kbps (Global)  Priority: 7  7   Affinity: 0x0/0xFFFF
    Metric Type: TE (default)
    AutoRoute: disabled LockDown: disabled Loadshare: 0 [0] bw-based
    auto-bw: disabled
  Active Path Option Parameters:
    State: dynamic path option 100 is active
    BandwidthOverride: disabled  LockDown: disabled  Verbatim: disabled


  InLabel  :  -
  OutLabel : GigabitEthernet1, 25
  Next Hop : 10.1.3.3
  RSVP Signalling Info:
       Src 192.0.2.1, Dst 192.0.2.13, Tun_Id 100, Tun_Instance 24
    RSVP Path Info:
      My Address: 10.1.3.1   
      Explicit Route: 10.1.3.3 10.3.9.3 10.3.9.9 10.9.14.9 
                      10.9.14.14 10.13.14.14 10.13.14.13 192.0.2.13 
      Record   Route:   NONE
      Tspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits
    RSVP Resv Info:
      Record   Route:   NONE
      Fspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits
  Shortest Unconstrained Path Info:
    Path Weight: 30 (TE)
    Explicit Route: 10.1.3.1 10.1.3.3 10.3.14.3 10.3.14.14 
                    10.13.14.14 10.13.14.13 192.0.2.13 

  History:
    Tunnel:
      Time since created: 16 minutes, 54 seconds
      Time since path change: 9 minutes, 14 seconds
      Number of LSP IDs (Tun_Instances) used: 24
    Current LSP: [ID: 24]
      Uptime: 9 minutes, 14 seconds
    Prior LSP: [ID: 23]
      ID: path option unknown
      Removal Trigger: path error


CSR3
interface GigabitEthernet2
 mpls traffic-eng administrative-weight 100


CSR1#show mpls traffic-eng tunnels tunnel 100 

Name: CSR1_t100                           (Tunnel100) Destination: 192.0.2.13
  Status:
    Admin: up         Oper: up     Path: valid       Signalling: connected
    path option 100, type dynamic (Basis for Setup, path weight 50)

  Config Parameters:
    Bandwidth: 0        kbps (Global)  Priority: 7  7   Affinity: 0x0/0xFFFF
    Metric Type: TE (default)
    AutoRoute: disabled LockDown: disabled Loadshare: 0 [0] bw-based
    auto-bw: disabled
  Active Path Option Parameters:
    State: dynamic path option 100 is active
    BandwidthOverride: disabled  LockDown: disabled  Verbatim: disabled


  InLabel  :  -
  OutLabel : GigabitEthernet1, 26
  Next Hop : 10.1.3.3
  RSVP Signalling Info:
       Src 192.0.2.1, Dst 192.0.2.13, Tun_Id 100, Tun_Instance 26
    RSVP Path Info:
      My Address: 10.1.3.1   
      Explicit Route: 10.1.3.3 10.3.9.3 10.3.9.9 10.9.15.9 
                      10.9.15.15 10.14.15.15 10.14.15.14 10.13.14.14 
                      10.13.14.13 192.0.2.13 
      Record   Route:   NONE
      Tspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits
    RSVP Resv Info:
      Record   Route:   NONE
      Fspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits
  Shortest Unconstrained Path Info:
    Path Weight: 50 (TE)
    Explicit Route: 10.1.3.1 10.1.3.3 10.3.9.3 10.3.9.9 
                    10.9.15.9 10.9.15.15 10.14.15.15 10.14.15.14 
                    10.13.14.14 10.13.14.13 192.0.2.13 

  History:
    Tunnel:
      Time since created: 23 minutes, 23 seconds
      Time since path change: 16 seconds
      Number of LSP IDs (Tun_Instances) used: 26
    Current LSP: [ID: 26]
      Uptime: 16 seconds
    Prior LSP: [ID: 25]
      ID: path option unknown
      Removal Trigger: path verification failed

By modifying the admin weight on CSR3 for G2 we now force the TE path to take this path.
​CSR1 > CSR3 > XR9 > XR15 > XR14 > XR13.


RP/0/0/CPU0:XR13#show mpls traffic-eng tunnels 100
Sun Sep 15 23:16:07.584 UTC


Name: tunnel-te100  Destination: 192.0.2.1  Ifhandle:0x980 
  Signalled-Name: XR13_t100
  Status:
    Admin:    up Oper:   up   Path:  valid   Signalling: connected

    path option 100,  type dynamic  (Basis for Setup, path weight 30)
    G-PID: 0x0800 (derived from egress interface properties)
    Bandwidth Requested: 0 kbps  CT0
    Creation Time: Sun Sep 15 23:15:09 2019 (00:00:58 ago)
  Config Parameters:
    Bandwidth:        0 kbps (CT0) Priority:  7  7 Affinity: 0x0/0xffff
    Metric Type: TE (default)
    Path Selection:
      Tiebreaker: Min-fill (default)
    Hop-limit: disabled
    Cost-limit: disabled
    Path-invalidation timeout: 10000 msec (default), Action: Tear (default)
    AutoRoute: disabled  LockDown: disabled   Policy class: not set
    Forward class: 0 (default)
    Forwarding-Adjacency: disabled
    Loadshare:          0 equal loadshares
    Auto-bw: disabled
    Fast Reroute: Disabled, Protection Desired: None
    Path Protection: Not Enabled
    BFD Fast Detection: Disabled
    Reoptimization after affinity failure: Enabled
    Soft Preemption: Disabled
  History:
    Tunnel has been up for: 00:00:58 (since Sun Sep 15 23:15:09 UTC 2019)
    Current LSP:
      Uptime: 00:00:58 (since Sun Sep 15 23:15:09 UTC 2019)

  Path info (IS-IS 1 level-1):
  Node hop count: 3
  Hop0: 10.13.14.14
  Hop1: 10.3.14.14
  Hop2: 10.3.14.3
  Hop3: 10.1.3.3
  Hop4: 10.1.3.1
  Hop5: 192.0.2.1

LSP Tunnel 192.0.2.1 100 [26] is signalled, Signaling State: up
  Tunnel Name: CSR1_t100 Tunnel Role: Tail
  InLabel: GigabitEthernet0/0/0/0, implicit-null
  Signalling Info:
    Src 192.0.2.1 Dst 192.0.2.13, Tun ID 100, Tun Inst 26, Ext ID 192.0.2.1
    Router-IDs: upstream   192.0.2.14
                local      192.0.2.13
    Bandwidth: 0 kbps (CT0) Priority:  7  7 DSTE-class: 0
    Soft Preemption: None
    SRLGs: not collected
    Path Info:
      Incoming Address: 10.13.14.13
      Incoming:
      Explicit Route:
        Strict, 10.13.14.13
        Strict, 192.0.2.13

      Record Route: Disabled
      Tspec: avg rate=0 kbits, burst=1000 bytes, peak rate=0 kbits
      Session Attributes: Local Prot: Not Set, Node Prot: Not Set, BW Prot: Not Set
                          Soft Preemption Desired: Not Set
    Resv Info: None
      Record Route: Disabled
      Fspec: avg rate=0 kbits, burst=1000 bytes, peak rate=0 kbits
Displayed 1 (of 1) heads, 0 (of 0) midpoints, 1 (of 1) tails
Displayed 1 up, 0 down, 0 recovering, 0 recovered heads

XR14
mpls traffic-eng
 interface GigabitEthernet0/0/0/0
  admin-weight 100

XR13
RP/0/0/CPU0:XR13(config)#int tunnel-te 100
RP/0/0/CPU0:XR13(config-if)#shut 
RP/0/0/CPU0:XR13(config-if)#commit
RP/0/0/CPU0:XR13(config-if)#no shut
RP/0/0/CPU0:XR13(config-if)#commit

RP/0/0/CPU0:XR13#show mpls traffic-eng tunnels 100
Sun Sep 15 23:21:38.872 UTC


Name: tunnel-te100  Destination: 192.0.2.1  Ifhandle:0x980 
  Signalled-Name: XR13_t100
  Status:
    Admin:    up Oper:   up   Path:  valid   Signalling: connected

    path option 100,  type dynamic  (Basis for Setup, path weight 50)
    G-PID: 0x0800 (derived from egress interface properties)
    Bandwidth Requested: 0 kbps  CT0
    Creation Time: Sun Sep 15 23:15:09 2019 (00:06:30 ago)
  Config Parameters:
    Bandwidth:        0 kbps (CT0) Priority:  7  7 Affinity: 0x0/0xffff
    Metric Type: TE (default)
    Path Selection:
      Tiebreaker: Min-fill (default)
    Hop-limit: disabled
    Cost-limit: disabled
    Path-invalidation timeout: 10000 msec (default), Action: Tear (default)
    AutoRoute: disabled  LockDown: disabled   Policy class: not set
    Forward class: 0 (default)
    Forwarding-Adjacency: disabled
    Loadshare:          0 equal loadshares
    Auto-bw: disabled
    Fast Reroute: Disabled, Protection Desired: None
    Path Protection: Not Enabled
    BFD Fast Detection: Disabled
    Reoptimization after affinity failure: Enabled
    Soft Preemption: Disabled
  History:
    Tunnel has been up for: 00:00:06 (since Sun Sep 15 23:21:33 UTC 2019)
    Current LSP:
      Uptime: 00:00:06 (since Sun Sep 15 23:21:33 UTC 2019)
    Prior LSP:
      ID: 3 Path Option: 100
      Removal Trigger: tunnel shutdown

  Path info (IS-IS 1 level-1):
  Node hop count: 5
  Hop0: 10.13.14.14
  Hop1: 10.14.15.14
  Hop2: 10.14.15.15
  Hop3: 10.9.15.15
  Hop4: 10.9.15.9
  Hop5: 10.3.9.9
  Hop6: 10.3.9.3
  Hop7: 10.1.3.3
  Hop8: 10.1.3.1
  Hop9: 192.0.2.1


LSP Tunnel 192.0.2.1 100 [26] is signalled, Signaling State: up
  Tunnel Name: CSR1_t100 Tunnel Role: Tail
  InLabel: GigabitEthernet0/0/0/0, implicit-null
  Signalling Info:
    Src 192.0.2.1 Dst 192.0.2.13, Tun ID 100, Tun Inst 26, Ext ID 192.0.2.1
    Router-IDs: upstream   192.0.2.14
                local      192.0.2.13
    Bandwidth: 0 kbps (CT0) Priority:  7  7 DSTE-class: 0
    Soft Preemption: None
    SRLGs: not collected
    Path Info:
      Incoming Address: 10.13.14.13
      Incoming:
      Explicit Route:
        Strict, 10.13.14.13
        Strict, 192.0.2.13

      Record Route: Disabled
      Tspec: avg rate=0 kbits, burst=1000 bytes, peak rate=0 kbits
      Session Attributes: Local Prot: Not Set, Node Prot: Not Set, BW Prot: Not Set
                          Soft Preemption Desired: Not Set
    Resv Info: None
      Record Route: Disabled
      Fspec: avg rate=0 kbits, burst=1000 bytes, peak rate=0 kbits
Displayed 1 (of 1) heads, 0 (of 0) midpoints, 1 (of 1) tails
Displayed 1 up, 0 down, 0 recovering, 0 recovered heads

XR13 > XR14 > XR15 > XR9 > CSR3 > CSR1.
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  • Home
  • Technology VoD!
    • Cisco >
      • Route & Switch / Enterprise Infrastructure
  • Technology Breakdowns!
    • Route&Switch/Ent. Infra. >
      • L2 Technologies
      • L3 Technologies
      • VPN Technologies
      • Services >
        • IOS - Dynamic NAT
        • HSRP - IPv4 Setup
        • HSRP - Priority and Preemption
    • Service Provider >
      • IGPs (Interior Gateway Protocols)
      • First Hop Redundancy >
        • HSRP (Hot Standby Router Protocol) >
          • HSRP - IOS/IOS XE Setup
          • HSRP - IOS XR Setup
      • BGP (Border Gateway Protocol)
      • Inter AS Multicast (MSDP)
      • Intra-AS MPLS
      • Inter-AS MPLS
    • Security >
      • IOS Firewall
      • ASA Firewall
      • FirePOWER Threat Defense >
        • FTD - FTD NGFW Device Setup and FMC Integration
      • VPNs >
        • PKI
        • Site to Site VPNs
        • Remote Access VPNs >
          • IOS Remote Access
          • ASA Remote Access
    • Data Center >
      • Nexus 9000v >
        • Nexus 9000v - Enabling Features
        • Nexus 9000v - VLANs and Trunks
        • Nexus 9000v - LACP Port Channels
        • Nexus 9000v - vPC (Virtual Port Channel)
        • Nexus 9000v - OSPFv2
        • Nexus 9000v - VXLAN - Ingress Replication Flood and Learn
        • Nexus 9000v - IP Multicast
        • Nexus 9000v - VxLAN - Multicast Flood and Learn
        • Nexus 9000v - VxLAN - BGP EVPN with Multicast
        • Nexus 9000v - VxLAN - BGP EVPN w/Ingress Replication
        • Nexus 9000v - VxLAN - Inter-VxLAN Routing with BGP EVPN
        • Nexus 9000v - VXLAN - External Routing
      • Nexus 7000v
    • Palo Alto