Add Diverse LSPs

When creating a route between two sites, you might not want to rely on a single LSP to send traffic from one site to another. By creating a second LSP (routing path) between the two sites, you can protect your network against failures and balance the network load.

Note:

If the PCE is unable to achieve the diversity level you request, it still creates the diverse LSP pair, using a diversity level as close as possible to the level you requested.
By default, the PCE does not reroute a diverse LSP pair when there is a network outage. For diverse LSPs to be rerouted, you can use the Path Optimization feature (Network > Topology > Path Optimization) and schedule path optimization to occur at regular intervals.
When provisioning diverse LSPs, the PCE might return an error if the value you specified in the Site field on the Edit Node page (Network > Topology > Node tab > Edit icon) contains special characters. Hence, we recommend using alphanumeric characters only.

To add diverse LSPs:

Select Network > Topology.

The Topology page is displayed with the topology map at the center and the network information table at the bottom of the page.
In the Tunnel tab, select Provisioning > Diverse LSPs.
The Add Diverse Tunnels page appears.
Complete the configuration on each tab of the Add Diverse Tunnels page according to the guidelines in Table 1.
Note:
Fields marked with an asterisk (*) are mandatory.
(Optional) Click Preview Paths at the bottom of the page to see the paths drawn on the topology map.
Click Add to add the LSPs.
A confirmation message appears on the top of the page, indicating that an add tunnel request was successfully created. The LSPs are automatically approved and deployed on the devices.The LSPs then appear in the Tunnel tab of the network information table (in the Topology page).

Table 1: Fields on the Add Diverse Tunnels Page
Field	Description
Properties
Provisioning Method	From the list, select one of the following methods to be used to provision the LSP: NETCONF (default)—The LSPs are statically provisioned and the associated configuration statements appear in the router configuration file. Upon provisioning, these LSPs are added as device-controlled LSPs. PCEP (Path Computation Element Protocol)—The LSPs are initiated by the path computation element (PCE) and the associated configuration statements do not appear in the router configuration file. Upon provisioning, these LSPs are added as PCE-initated LSPs. Note: For IOS-XR routers, NETCONF-based LSP provisioning has the same capabilities as PCEP-based LSP provisioning.
Provisioning Type	From the list, select the type of LSP that you want to provision (RSVP or SR (segment routing)).
Diversity Group	Specify the name of a group of tunnels to which this tunnel belongs, and for which diverse paths are desired.
Diversity Level	From the list, select the level of diversity for the LSP: Default—No diversity level is applied. Site—Two paths don’t intersect at any given site (aside from the source and destination). Site diversity is the strongest as it includes SRLG and link diversity. SRLG (Shared Risk Link Group)—Two paths don't intersect at any of the group’s links or nodes (aside from the source and destination). SRLG diversity includes link diversity. Note: If two paths are SRLG-diverse, the paths will not be routed over links which are in the same SRLG. The SRLGs can be learned from network protocols such as BGP-LS and NETCONF. The SRLGs can change dynamically and are displayed in the SRLG/Facility tab in the network information table. If the links become part of the same SRLG, the previously computed tunnels are no more diverse. In this scenario, new tunnels will not be automatically computed and applied in the network. You must manually select each tunnel (from the Tunnel tab) that is no longer diverse and request reprovisioning (Tunnel tab > Provisioning > Reprovision). Link—Two paths don’t intersect at any given link. Link diversity is the weakest.
Tunnel 1 Note: The same fields are available for Tunnel 2. Use the same guidelines to configure the fields for Tunnel 2.
Name	Specify a unique name for the first LSP. You can use any number of alphanumeric characters, hyphens, and underscores.
Node A	From the list, select the node that you want to use as the ingress node.
Node Z	From the list, select the node that you want to use as the egress node.
IP Z	From the list, select the IP address for Node Z (that is, the egress node). The options in the list are populated based on the Node Z that you selected.
Admin Status	The PCS uses the administration status of the LSP to decide whether to route or provision, or both route and provision the LSP. If the LSP is routed, no traffic flows through the LSP and its operational status is Up. If the LSP is provisioned, traffic flows through the LSP and its operational status is Active. Select one of the following options as the administration status: Up—If you select this option, the PCS routes and provisions the LSP. Planned—If you select this option, the PCS routes the LSP and reserves capacities for the LSP. However, the PCS doesn’t provision the LSP. Shutdown—If you select this option, the PCS neither routes nor provisions the LSP. The LSP is maintained in the datastore and is associated with a persist state so that the LSP can be brought back up at a later time, if required.
Planned Bandwidth	Specify the planned bandwidth (along with valid units, with no space between the bandwidth and units) for the LSP. If you specify a value without units, bps is applied. The valid units are: B or b (bps) M or m (Mbps) K or k (Kbps) G or g (Gbps) Examples: 50M, 1000b, 25g.
Planned Metric	Specify the static tunnel metric. The PCE uses this metric to route the LSP instead of allowing the router itself to choose a path.
Bandwidth Sizing	Note: This option is displayed only when you select PCEP as the provisioning method. Click the toggle button to enable bandwidth sizing for the LSP. If enabled, the LSP is included in the periodic re-computation of planned bandwidth based on aggregated LSP traffic statistics. If you enable bandwidth sizing, you must configure the following parameters: Adjustment Threshold Minimum Bandwidth Maximum Bandwidth Minimum Variation Threshold
Adjustment Threshold (%)	Note: This option is available only when you enable bandwidth sizing. Specify the sensitivity (in %) of the automatic bandwidth adjustment. The new planned bandwidth is considered only if it differs from the existing bandwidth by the value of this setting or more. The default value is 10%.
Minimum Bandwidth	Note: This option is available only when you enable bandwidth sizing. Specify the minimum planned bandwidth (along with valid units, with no space between the bandwidth and units) for the LSP. If you specify a value without units, bps is applied. If the new planned bandwidth is less than the minimum setting, the PCE signals the LSP with the minimum bandwidth. However, if the new planned bandwidth falls in between the maximum and minimum settings, the PCE signals the LSP with the new planned bandwidth. The valid units are: B or b (bps) M or m (Mbps) K or k (Kbps) G or g (Gbps) Examples: 50M, 1000b, 25g.
Maximum Bandwidth	Note: This option is available only when you enable bandwidth sizing. Specify the maximum planned bandwidth (along with valid units, with no space between the bandwidth and units) for the LSP. If you specify a value without units, bps is applied. If the new planned bandwidth is greater than the maximum setting, the PCE signals the LSP with the maximum bandwidth. However, if the new planned bandwidth falls in between the maximum and minimum settings, the PCE signals the LSP with the new planned bandwidth. The valid units are: B or b (bps) M or m (Mbps) K or k (Kbps) G or g (Gbps) Examples: 50M, 1000b, 25g.
Minimum Variation Threshold	Note: This option is available only when you enable bandwidth sizing. Specify the sensitivity of the automatic bandwidth adjustment when the new planned bandwidth is compared to the current planned bandwidth. Default: Zero. The new planned bandwidth is only considered if the difference is greater than or equal to the value of this setting. Because it is not a percentage, this can be used to prevent small fluctuations from triggering unnecessary bandwidth changes. If both the adjustment threshold and the minimum variation threshold are greater than zero, both settings are taken into consideration. In that case, the new planned bandwidth is considered if the percentage difference is greater than or equal to the adjustment threshold, and, the actual difference is greater than or equal to the minimum variation.
Color Community	Note: This field is available only for SR LSPs. Assign a color for the SR LSP that can be used to map traffic on the LSP.
Use Penultimate Hop as Signaling Address	Note: This field is available only for SR LSPs. Click the toggle button to enable the PCS to use the penultimate hop as the signaling address for Egress Peer Engineering (EPE). If you haven’t specified a color community, the setting applies to all traffic. If you’ve specified a color community, the setting applies to traffic in that color community.
Setup	Specify the setup priority for the tunnel traffic. Priority levels range from 0 (highest priority) through 7 (lowest priority). The default is 7, which is the standard MPLS LSP definition in Junos OS. Based on the setup priority, the PCE determines whether a new LSP can be established, by preempting an existing LSP. The existing LSP can be preempted if the setup priority of the new LSP is higher than that of the existing LSP and the preemption releases enough bandwidth for the new LSP.
Hold	Specify the hold priority for the tunnel traffic. Priority levels range from 0 (highest priority) through 7 (lowest priority). The default is 7, which is the standard MPLS LSP definition in Junos OS. Based on the hold priority, the PCE determines whether the LSP can be preempted or not. If the hold priority for an LSP is higher, it is unlikely for the LSP to be preempted.
Routing Method	From the list, select a routing method for the LSP to specify whether the PCE should compute and provision the path for the LSP, or not : The available options are: routeByDevice—This is the default routing method when a PCC-controlled LSP is created or learned by the PCE. For this method, the PCE does not compute and provision a path. This method is appropriate for three types of LSPs: RSVP TE PCC-controlled LSPs, segment routing PCEP-based LSPs, and segment routing NETCONF-based LSPs. Other routing methods (default, delay, adminWeight, constant, distance, ISIS, OSPF)—When a PCC-controlled LSP has a routing method that is not routeByDevice, the PCE computes and provisions the path as a strict explicit route when provisioning the LSP. The LSP’s existing explicit route might be modified to a the PCE-computed strict explicit route. For example, a loose explicit route specified by you or learned from the router would be modified to a strict explicit route.
Constraints Note: The same fields are available for Tunnel 2. Use the same guidelines to configure the fields for Tunnel 2.
Tunnel 1
Admin Group Include All	From the list, select one or more admin group bits for the LSP to traverse links that include all of the admin groups specified in this field. You can select a maximum of 32 admin group bits. The admin group bits are mapped to meaningful names, such as colors (configured in the Configuration > Network > Admin Group page), so that you can easily differentiate the different traffic routes in the display and also use coloring constraints to influence the path of the LSP.
Admin Group Include Any	From the list, select one or more admin group bits for the LSP to traverse links that include at least one of the admin groups specified in this field. The maximum selections allowed is 32.
Admin Group Exclude	From the list, select one or more admin group bits for the LSP to traverse links that do not include any of the admin groups specified in this field. The maximum selections allowed is 32.
Advanced Note: The same fields are available for Tunnel 2. Use the same guidelines to configure the fields for Tunnel 2.
Tunnel 1
Description	Specify a comment or description for the LSP for your reference.
Symmetric Pair Group	Specify a unique name for the symmetric pair group. You can use any number of alphanumeric and special characters. LSPs with the same group name (as specified in this field) are considered part of a symmetric pair group. You create a symmetric pair group so that the LSP from the ingress node to the egress node follows the same path as the LSP from the egress node to the ingress node. When there are two tunnels with the same end nodes but in opposite directions, the path routing uses the same set of links. For example, suppose Tunnel1 source to destination is NodeA to NodeZ, and Tunnel2 source to destination is NodeZ to NodeA. Selecting Tunnel1-Tunnel2 as a symmetric pair group places both tunnels along the same set of links. Tunnels in the same group are paired based on the source and destination node.
Create Symmetric Pair	Note: This option is displayed only when you specify a symmetric pair group. Click the toggle button to enable the creation of a symmetric pair. This option allows you to create the symmetric pair in the same operation as creating the diverse LSP.
Custom Attributes	Click the Add icon (+) to specify provisioning properties not directly supported by the GUI. For example, you cannot specify a hop-limit when you provision an LSP. However, you can add hop-limit as a custom attribute. At the edit > protocols > mpls > label-switched-path hierarchy level in the NETCONF template file, you must add the statements needed to provision with the property you are adding. If the property is present with the defined value, then the provisioning statement is executed.
Schedule
Plan	No Schedule—(Default) LSP provisioning is not scheduled (that is, LSPs are provisioned immediately upon submission of the provisioning request). Once—In the Start and End fields that appear, specify the start date and time and end date and time at which you want to provision the LSPs. The LSPs are provisioned once at the specified date and time. Recurring Daily—Specify the start and end dates and start and end times in the Start Date, End Date, Start Time, and End Time fields that appear. The LSPs are provisioned daily.

Add Diverse LSPs

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