Configuring and Operating RSVP-TE LSP with PCEP

This section provides information about configuring and operating RSVP-TE LSP with PCEP using CLI.

The following describes the detailed configuration of an inter-area RSVP-TE LSP with both a primary path and a secondary path. The network uses IS-IS with the backbone area in Level 2 and the leaf areas in Level 1. Topology discovery is learned by NRC-P using BGP-LS.

The LSP uses an admin-group constraint to keep the paths of the secondary and primary link disjoint in the backbone area. The LSP is PCE-controlled but also has path-computation-method pce enabled so the initial path, and any MBB path, is also computed by PCE.

The NSP and SR OS load versions used to produce this example are:

Figure 1 shows a multi-level IS-IS topology in the NSP GUI:

Figure 1. Multi-level IS-IS Topology in the NSP GUI

The following example shows the configuration and show command output of the PCEP on the PCE node and the PCC node.

*A:PCE Server 226>config>router>pcep>pce# info
----------------------------------------------
            local-address 192.168.48.226
            no shutdown
----------------------------------------------
*A:Reno 194>config>router>pcep>pcc# info
----------------------------------------------
            peer 192.168.48.226
                no shutdown
            exit
            no shutdown
----------------------------------------------

*A:PCE Server 226>config>router>pcep>pce# show router pcep pce status
===============================================================================
Path Computation Element Protocol (PCEP) Path Computation Element (PCE) Info
===============================================================================
Admin Status           : Up              Oper Status          : Up
Unknown Msg Limit      : 10 msg/min
Keepalive Interval     : 30 seconds      DeadTimer Interval   : 120 seconds
Capabilities List      : stateful-delegate stateful-pce segment-rt-path
Local Address          : 192.168.48.226
PCE Overloaded         : false
-------------------------------------------------------------------------------
PCEP Path Computation Element (PCE) Peer Info
-------------------------------------------------------------------------------
Peer                       Sync State             Oper Keepalive/Oper DeadTimer
-------------------------------------------------------------------------------
192.168.48.190:4189        done                   30/120
192.168.48.194:4189        done                   30/120
192.168.48.198:4189        done                   30/120
192.168.48.199:4189        done                   30/120
192.168.48.219:4189        done                   30/120
192.168.48.221:4189        done                   30/120
192.168.48.224:4189        done                   30/120
-------------------------------------------------------------------------------
===============================================================================

*A:Reno 194# show router pcep pcc status
=======================================================================
Path Computation Element Protocol (PCEP) Path Computation Client (PCC) Info
=======================================================================
Admin Status           : Up              Oper Status          : Up
Unknown Msg Limit      : 10 msg/min
Keepalive Interval     : 30 seconds      DeadTimer Interval   : 120 seconds
Capabilities List      : stateful-delegate stateful-pce segment-rt-path
Address                : 192.168.48.194
Report Path Constraints: True
-----------------------------------------------------------------------
PCEP Path Computation Client (PCC) Peer Info
-----------------------------------------------------------------------
Peer                       Admin State/Oper State Oper Keepalive/Oper DeadTimer
-----------------------------------------------------------------------
192.168.48.226             Up/Up                  30/120
-----------------------------------------------------------------------
=======================================================================

*A:Reno 194# show router pcep pcc lsp-db
=======================================================================
PCEP Path Computation Client (PCC) LSP Update Info
=======================================================================
PCEP-specific LSP ID: 11
LSP ID              : 14378             LSP Type            : rsvp-p2p
Tunnel ID           : 1                 Extended Tunnel Id  : 192.168.48.194
LSP Name            : From Reno to Atlanta RSVP-TE::primary_empty
Source Address      : 192.168.48.194    Destination Address : 192.168.48.224
LSP Delegated       : True              Delegate PCE Address: 192.168.48.226
Oper Status         : active
-----------------------------------------------------------------------
PCEP-specific LSP ID: 12
LSP ID              : 14380             LSP Type            : rsvp-p2p
Tunnel ID           : 1                 Extended Tunnel Id  : 192.168.48.194
LSP Name            : From Reno to Atlanta RSVP-TE::secondary_empty
Source Address      : 192.168.48.194    Destination Address : 192.168.48.224
LSP Delegated       : True              Delegate PCE Address: 192.168.48.226
Oper Status         : up
=======================================================================

The following examples shows the configuration and show command output of BGP on the PCE node and the ABR node-to-learn topology using the BGP-LS NLRI family.

*A:PCE Server 226>config>router>bgp# info
----------------------------------------------
            family bgp-ls
            min-route-advertisement 1
            link-state-export-enable            
            group "IBGP_L2"
                family bgp-ls
                peer-as 65000
                neighbor 192.168.48.198
                exit
                neighbor 192.168.48.199
                exit
                neighbor 192.168.48.221
                exit
            exit
            no shutdown
----------------------------------------------

*A:Chicago 221>config>router>bgp# info
----------------------------------------------
            min-route-advertisement 1
            advertise-inactive
            link-state-import-enable            
            group "IBGP_L2"
                family bgp-ls
                peer-as 65000
                neighbor 192.168.48.226
                exit
            exit
            no shutdown
----------------------------------------------

*A:PCE Server 226# show router bgp summary
===============================================================================
 BGP Router ID:192.168.48.226    AS:65000       Local AS:65000
===============================================================================
BGP Admin State         : Up          BGP Oper State              : Up
Total Peer Groups       : 1           Total Peers                 : 3
Total BGP Paths         : 182         Total Path Memory           : 44896
Total IPv4 Remote Rts   : 0           Total IPv4 Rem. Active Rts  : 0
Total McIPv4 Remote Rts : 0           Total McIPv4 Rem. Active Rts: 0
Total McIPv6 Remote Rts : 0           Total McIPv6 Rem. Active Rts: 0
Total IPv6 Remote Rts   : 0           Total IPv6 Rem. Active Rts  : 0
Total IPv4 Backup Rts   : 0           Total IPv6 Backup Rts       : 0
Total Supressed Rts     : 0           Total Hist. Rts             : 0
Total Decay Rts         : 0
Total VPN Peer Groups   : 0           Total VPN Peers             : 0
Total VPN Local Rts     : 0
Total VPN-IPv4 Rem. Rts : 0           Total VPN-IPv4 Rem. Act. Rts: 0
Total VPN-IPv6 Rem. Rts : 0           Total VPN-IPv6 Rem. Act. Rts: 0
Total VPN-IPv4 Bkup Rts : 0           Total VPN-IPv6 Bkup Rts     : 0
Total VPN Supp. Rts     : 0           Total VPN Hist. Rts         : 0
Total VPN Decay Rts     : 0
Total L2-VPN Rem. Rts   : 0           Total L2VPN Rem. Act. Rts   : 0
Total MVPN-IPv4 Rem Rts : 0           Total MVPN-IPv4 Rem Act Rts : 0
Total MDT-SAFI Rem Rts  : 0           Total MDT-SAFI Rem Act Rts  : 0
Total MSPW Rem Rts      : 0           Total MSPW Rem Act Rts      : 0
Total RouteTgt Rem Rts  : 0           Total RouteTgt Rem Act Rts  : 0
Total McVpnIPv4 Rem Rts : 0           Total McVpnIPv4 Rem Act Rts : 0
Total McVpnIPv6 Rem Rts : 0           Total McVpnIPv6 Rem Act Rts : 0
Total MVPN-IPv6 Rem Rts : 0           Total MVPN-IPv6 Rem Act Rts : 0
Total EVPN Rem Rts      : 0           Total EVPN Rem Act Rts      : 0
Total FlowIpv4 Rem Rts  : 0           Total FlowIpv4 Rem Act Rts  : 0
Total FlowIpv6 Rem Rts  : 0           Total FlowIpv6 Rem Act Rts  : 0
Total LblIpv4 Rem Rts   : 0           Total LblIpv4 Rem. Act Rts  : 0
Total LblIpv6 Rem Rts   : 0           Total LblIpv6 Rem. Act Rts  : 0
Total LblIpv4 Bkp Rts   : 0           Total LblIpv6 Bkp Rts       : 0
Total Link State Rem Rts: 271         Total Link State Rem. Act Rts: 0
===============================================================================
BGP Summary
===============================================================================
Legend : D - Dynamic Neighbor
===============================================================================
Neighbor
Description
                   AS PktRcvd InQ  Up/Down   State|Rcv/Act/Sent (Addr Family)
                      PktSent OutQ
-------------------------------------------------------------------------------
192.168.48.198
               65000        0    0 02h42m56s Active
                            0    0
192.168.48.199
               65000      503    0 02h42m56s 76/0/0 (LinkState)
                          328    0
192.168.48.221
               65000      519    0 02h42m56s 195/0/0 (LinkState)
                          328    0
-------------------------------------------------------------------------------

*A:PCE Server 226# show router bgp routes bgp-ls hunt link
===============================================================================
 BGP Router ID:192.168.48.226    AS:65000       Local AS:65000
===============================================================================
 Legend -
 Status codes  : u - used, s - suppressed, h - history, d - decayed, * - valid
                 l - leaked, x - stale, > - best, b - backup, p - purge
 Origin codes  : i - IGP, e - EGP, ? - incomplete
===============================================================================
BGP-LS Link NLRIs
===============================================================================
-------------------------------------------------------------------------------
RIB In Entries
-------------------------------------------------------------------------------
Network:
 Type          : LINK-NLRI
 Protocol      : ISIS Level-2           Identifier     : 0xa
 Local Node descriptor:
  Autonomous System  : 0.0.253.232
  Link State Id      : 10
  IGP Router Id      : 0x38120048184
 Remote Node descriptor:
  Autonomous System  : 0.0.253.232
  Link State Id      : 10
  IGP Router Id      : 0x38120048223
 Link descriptor:
  IPV4 Interface Addr: 10.0.14.184
  IPV4 Neighbor Addr : 10.0.14.223
Nexthop        : 192.168.48.199
From           : 192.168.48.199
Res. Nexthop   : 0.0.0.0
Local Pref.    : 100                    Interface Name : NotAvailable
Aggregator AS  : None                   Aggregator     : None
Atomic Aggr.   : Not Atomic             MED            : None
AIGP Metric    : None
Connector      : None
Community      : No Community Members
Cluster        : No Cluster Members
Originator Id  : None                   Peer Router Id : 192.168.48.199
Flags          : Valid  Best  IGP
Route Source   : Internal
AS-Path        : No As-Path
Route Tag      : 0
Neighbor-AS    : N/A
Orig Validation: N/A
Source Class   : 0                      Dest Class     : 0
Add Paths Send : Default
Last Modified  : 02h27m50s
-------------------------------------------------------------------------------
Link State Attribute TLVs :
 Administrative group (color) : 0x0
 Maximum link bandwidth : 100000 Kbps
 Max. reservable link bandwidth : 100000 Kbps
 Unreserved bandwidth0 : 100000 Kbps
 Unreserved bandwidth1 : 100000 Kbps
 Unreserved bandwidth2 : 100000 Kbps
 Unreserved bandwidth3 : 100000 Kbps
 Unreserved bandwidth4 : 100000 Kbps
 Unreserved bandwidth5 : 100000 Kbps
 Unreserved bandwidth6 : 100000 Kbps
 Unreserved bandwidth7 : 100000 Kbps
 TE Default Metric : 100
 IGP Metric : 100
 Adjacency Segment Identifier (Adj-SID) :       flags 0x30 weight 0 sid 262136
-------------------------------------------------------------------------------
Network:
 Type          : LINK-NLRI
 Protocol      : ISIS Level-2           Identifier     : 0xa
 Local Node descriptor:
  Autonomous System  : 0.0.253.232
  Link State Id      : 10
  IGP Router Id      : 0x38120048184
 Remote Node descriptor:
  Autonomous System  : 0.0.253.232
  Link State Id      : 10
  IGP Router Id      : 0x38120048223
 Link descriptor:
  IPV4 Interface Addr: 10.0.14.184
  IPV4 Neighbor Addr : 10.0.14.223
Nexthop        : 192.168.48.221
From           : 192.168.48.221
Res. Nexthop   : 0.0.0.0
Local Pref.    : 100                    Interface Name : NotAvailable
Aggregator AS  : None                   Aggregator     : None
Atomic Aggr.   : Not Atomic             MED            : None
AIGP Metric    : None
Connector      : None
Community      : No Community Members
Cluster        : No Cluster Members
Originator Id  : None                   Peer Router Id : 192.168.48.221
Flags          : Valid  IGP
TieBreakReason : OriginatorID
Route Source   : Internal
AS-Path        : No As-Path
Route Tag      : 0
Neighbor-AS    : N/A
Orig Validation: N/A
Source Class   : 0                      Dest Class     : 0
Add Paths Send : Default
Last Modified  : 02h27m54s
-------------------------------------------------------------------------------
Link State Attribute TLVs :
 Administrative group (color) : 0x0
 Maximum link bandwidth : 100000 Kbps
 Max. reservable link bandwidth : 100000 Kbps
 Unreserved bandwidth0 : 100000 Kbps
 Unreserved bandwidth1 : 100000 Kbps
 Unreserved bandwidth2 : 100000 Kbps
 Unreserved bandwidth3 : 100000 Kbps
 Unreserved bandwidth4 : 100000 Kbps
 Unreserved bandwidth5 : 100000 Kbps
 Unreserved bandwidth6 : 100000 Kbps
 Unreserved bandwidth7 : 100000 Kbps
 TE Default Metric : 100
 IGP Metric : 100
 Adjacency Segment Identifier (Adj-SID) :       flags 0x30 weight 0 sid 262136
-------------------------------------------------------------------------------

Figure 2 shows primary and secondary RSVP-TE LSP paths in the NSP GUI.

Figure 2. Primary and Secondary RSVP-TE LSP Paths in the NSP GUI

The following example shows the configuration and show command output of the MPLS on the PCC node.

*A:Reno 194>config>router>mpls>lsp# info
----------------------------------------------
                to 192.168.48.224
                egress-statistics
                    shutdown
                exit
                fast-reroute facility
                    no node-protect
                exit
                path-computation-method pce
                pce-report enable
                pce-control
                revert-timer 1
                primary "primary_empty"
                    exclude "top"
                    bandwidth 10
                exit
                secondary "secondary_empty"
                    standby
                    exclude "bottom"
                    bandwidth 5
                exit
                no shutdown
----------------------------------------------

*A:Reno 194# show router mpls lsp "From Reno to Atlanta RSVP-TE" path detail
===============================================================================
MPLS LSP From Reno to Atlanta RSVP-TE Path  (Detail)
===============================================================================
Legend :
    @ - Detour Available              # - Detour In Use
    b - Bandwidth Protected           n - Node Protected
    s - Soft Preemption
    S - Strict                        L - Loose
    A - ABR
===============================================================================
-------------------------------------------------------------------------------
LSP From Reno to Atlanta RSVP-TE Path primary_empty
-------------------------------------------------------------------------------
LSP Name         : From Reno to Atlanta RSVP-TE
Path LSP ID      : 14382
From             : 192.168.48.194       To                   : 192.168.48.224
Admin State      : Up                   Oper State           : Up
Path Name        : primary_empty        Path Type            : Primary
Path Admin       : Up                   Path Oper            : Up
Out Interface    : 1/1/1                Out Label            : 262094
Path Up Time     : 0d 00:00:22          Path Down Time       : 0d 00:00:00
Retry Limit      : 0                    Retry Timer          : 30 sec
Retry Attempt    : 0                    Next Retry In        : 0 sec
BFD Template     : None                 BFD Ping Interval    : 60
BFD Enable       : False
Adspec           : Disabled             Oper Adspec          : Disabled
CSPF             : Enabled              Oper CSPF            : Enabled
Least Fill       : Disabled             Oper LeastFill       : Disabled
FRR              : Enabled              Oper FRR             : Enabled
FRR NodeProtect  : Disabled             Oper FRR NP          : Disabled
FR Hop Limit     : 16                   Oper FRHopLimit      : 16
FR Prop Admin Gr*: Disabled             Oper FRPropAdmGrp    : Disabled
Propogate Adm Grp: Disabled             Oper Prop Adm Grp    : Disabled
Inter-area       : False
PCE Updt ID      : 0
PCE Report       : Enabled              Oper PCE Report      : Enabled
PCE Control      : Enabled              Oper PCE Control     : Enabled
PCE Compute      : Enabled
Neg MTU          : 1496                 Oper MTU             : 1496
Bandwidth        : 10 Mbps              Oper Bandwidth       : 10 Mbps
Hop Limit        : 255                  Oper HopLimit        : 255
Record Route     : Record               Oper Record Route    : Record
Record Label     : Record               Oper Record Label    : Record
Setup Priority   : 7                    Oper Setup Priority  : 7
Hold Priority    : 0                    Oper Hold Priority   : 0
Class Type       : 0                    Oper CT              : 0
Backup CT        : None
MainCT Retry     : n/a
    Rem          :
MainCT Retry     : 0
    Limit        :
Include Groups   :                      Oper Include Groups  :
None                                           None
Exclude Groups   :                      Oper Exclude Groups  :
top                                            top
Adaptive         : Enabled              Oper Metric          : 40
Preference       : n/a
Path Trans       : 7                    CSPF Queries         : 7172
Failure Code     : noError
Failure Node     : n/a
Explicit Hops    :
    No Hops Specified
Actual Hops      :
    10.202.5.194 (192.168.48.194) @               Record Label        : N/A
 -> 10.202.5.199 (192.168.48.199) @               Record Label        : 262094
 -> 192.168.48.185 (192.168.48.185)               Record Label        : 262111
 -> 10.0.5.185                                    Record Label        : 262111
 -> 192.168.48.223 (192.168.48.223)               Record Label        : 262121
 -> 10.0.7.223                                    Record Label        : 262121
 -> 192.168.48.224 (192.168.48.224)               Record Label        : 262116
 -> 10.101.4.224                                  Record Label        : 262116
Computed Hops    :
    10.202.5.199(S)
 -> 10.0.5.185(S)
 -> 10.0.7.223(S)
 -> 10.101.4.224(S)
Resignal Eligible: False
Last Resignal    : n/a                  CSPF Metric          : 40
-------------------------------------------------------------------------------
LSP From Reno to Atlanta RSVP-TE Path secondary_empty
-------------------------------------------------------------------------------
LSP Name         : From Reno to Atlanta RSVP-TE
Path LSP ID      : 14384
From             : 192.168.48.194       To                   : 192.168.48.224
Admin State      : Up                   Oper State           : Up
Path Name        : secondary_empty      Path Type            : Standby
Path Admin       : Up                   Path Oper            : Up
Out Interface    : 1/1/1                Out Label            : 262091
Path Up Time     : 0d 00:00:25          Path Down Time       : 0d 00:00:00
Retry Limit      : 0                    Retry Timer          : 30 sec
Retry Attempt    : 0                    Next Retry In        : 0 sec
BFD Template     : None                 BFD Ping Interval    : 60
BFD Enable       : False
Adspec           : Disabled             Oper Adspec          : Disabled
CSPF             : Enabled              Oper CSPF            : Enabled
Least Fill       : Disabled             Oper LeastFill       : Disabled
Propogate Adm Grp: Disabled             Oper Prop Adm Grp    : Disabled
Inter-area       : False
PCE Updt ID      : 0
PCE Report       : Enabled              Oper PCE Report      : Enabled
PCE Control      : Enabled              Oper PCE Control     : Enabled
PCE Compute      : Enabled
Neg MTU          : 1496                 Oper MTU             : 1496
Bandwidth        : 5 Mbps               Oper Bandwidth       : 5 Mbps
Hop Limit        : 255                  Oper HopLimit        : 255
Record Route     : Record               Oper Record Route    : Record
Record Label     : Record               Oper Record Label    : Record
Setup Priority   : 7                    Oper Setup Priority  : 7
Hold Priority    : 0                    Oper Hold Priority   : 0
Class Type       : 0                    Oper CT              : 0
Include Groups   :                      Oper Include Groups  :
None                                           None
Exclude Groups   :                      Oper Exclude Groups  :
bottom                                         bottom
Adaptive         : Enabled              Oper Metric          : 60
Preference       : 255
Path Trans       : 28                   CSPF Queries         : 10
Failure Code     : noError
Failure Node     : n/a
Explicit Hops    :
    No Hops Specified
Actual Hops      :
    10.202.5.194 (192.168.48.194)                 Record Label        : N/A
 -> 10.202.5.199 (192.168.48.199)                 Record Label        : 262091
 -> 10.0.9.198 (192.168.48.198)                   Record Label        : 262096
 -> 192.168.48.184 (192.168.48.184)               Record Label        : 262102
 -> 10.0.2.184                                    Record Label        : 262102
 -> 192.168.48.221 (192.168.48.221)               Record Label        : 262119
 -> 10.0.4.221                                    Record Label        : 262119
 -> 192.168.48.223 (192.168.48.223)               Record Label        : 262088
 -> 10.0.10.223                                   Record Label        : 262088
 -> 192.168.48.224 (192.168.48.224)               Record Label        : 262115
 -> 10.101.4.224                                  Record Label        : 262115
Computed Hops    :
    10.202.5.199(S)
 -> 10.0.9.198(S)
 -> 10.0.2.184(S)
 -> 10.0.4.221(S)
 -> 10.0.10.223(S)
 -> 10.101.4.224(S)
Srlg             : Disabled
Srlg Disjoint    : False
Resignal Eligible: False
Last Resignal    : n/a                  CSPF Metric          : 60
===============================================================================