Known Behavior
The following behaviors are known to occur in NorthStar Controller Release 6.2.0:
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PCEP P2MP: NorthStar automatically reroutes PCEP P2MP groups around a network element failure. After the failed element comes back up, the group might not be automatically restored to the original path, even if the user chooses to optimize LSP paths. In a future NorthStar release, the concept of what constitutes an optimal P2MP group will be addressed.
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Behaviors and limitations related to PCEP-provisioned P2MP Groups:
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This feature requires that you use Junos OS Release 18.3R2 or later, in which the following Junos OS PRs have been fixed:
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Junos OS PR 1412649
The fix for this PR enables you to define a separate template for P2MP (separate from the one used for P2P), one that does not allow “adaptive” to be configured. To define the new template, configure the following statements on the head end PE of the PCE-initiated P2MP LSP:
set protocols mpls lsp-external-controller pccd label-switched-path-template pccd_default_template set protocols mpls label-switched-path pccd_default_template template set protocols mpls label-switched-path pccd_default_template adaptive set protocols mpls lsp-external-controller pccd label-switched-path-p2mp-template pccd_p2mp_default_template set protocols mpls label-switched-path pccd_p2mp_default_template template set protocols mpls label-switched-path pccd_p2mp_default_template p2mp
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Junos OS PR 1412490
The fix for this PR ensures that deletion of P2MP PCEP branches is properly reported.
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Junos OS PR 1358245 (not specific to P2MP).
The fix for this PR ensures that segment routing (SR) path names are properly reported in Junos OS Release 18.3R2.
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When viewing P2MP groups in the network information table, be aware that the refresh button at the bottom of the table periodically turns orange to prompt you for a refresh. When you click the refresh button, the web UI client retrieves the latest P2MP sub-LSP status from the NorthStar server.
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NETCONF P2MP (Reprovisioning LSPs):
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For a NETCONF-provisioned P2MP tree, reprovisioning individual sub-LSPs to go around a failed link can fail under the following conditions:
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The user reprovisions sub-LSPs separately.
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The user has a mixture of sub-LSPs with a user-specified strict path and paths computed by NorthStar.
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The workflow is to reprovision all sub-LSPs of a tree together; NorthStar computes sub-LSPs of a tree as a whole, not individually.
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Automatic rerouting: Automatic rerouting of NETCONF-provisioned LSPs (including NETCONF-provisioned SR LSPs) due to a failure in the network is not supported.
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PCE-initiated LSP: During PCE-initiated LSP, some Cisco routers configured with IOS-XR version can return an error code for an unknown reason. Currently NorthStar Application only reports “NS_ERR_GENERIC” when this issue happens. It is planned to improve this behavior and report the exact error code (e.g. PCEP Error Type = 24 error value = 2 ) in future releases.
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Netflow Collector: Sometimes, during a NorthStar upgrade, netflowd cannot be started. If netflowd fails to start, run the following command on the system hosting the netflowd collector:
sudo -u pcs /opt/northstar/thirdparty/python/bin/pip -q install --upgrade --no-deps --force-reinstall /opt/pcs/lib/python/*.whl
After running the command, restart the Netflow process:
supervisorctl restart analytics:netflowd
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NorthStar Planner Web UI: Network spec files will be overwritten if an existing network name exists when using Save or Save As. A warning dialog appears if an existing name is found using Save As.
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PCEP Optional Ojects Are Not RFC 8697-Compliant: PCE Server cannot process messages in PC report (PCRpt) sent by Junos OS Release 21.4 and later as the association object order is non-compliant to RFC-8697. This results in the following issues:
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Container LSPs in the network are reported as down (even though they are not because PCS does not understand the information from Junos OS)
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You cannot configure PCE-initiated LSPs.
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You cannot view multiple-path LSPs.
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