Routing and Security Enhancements
Automatic Restart for IS-IS Graceful Restart
OcNOS enhances the restart isis graceful command to automatically restart the IS-IS routing process without requiring manual intervention from the Linux shell. This change ensures compliance with RFC 5306 and improves operational efficiency by allowing administrators to gracefully restart the protocol directly from the CLI. During the automatic restart, the Routing Information Base (RIB) remains active, ensuring that routes are not deleted from the forwarding table and preventing unintended network disruptions.
For more details, refer to the restart isis graceful command section in the OcNOS Layer 3 Guide, Release 7.0.1.
BGP LU: neighbor attribute-unchanged Support for IPv4/IPv6 Labeled-Unicast
OcNOS now supports the neighbor attribute-unchanged command for IPv4 and IPv6 Labeled-Unicast (LU) address families. This enhancement enables transparent BGP LU ASBR advertisements by preserving the original next-hop and LU labels during propagation.
For more details, refer to the
Dynamic Updation of Shared Risk Link Groups (SRLG)
To support the dynamic update of SRLG values, it is advised to configure re-optimization configuration on the tunnel.
Limitation:
There are exceptions to the dynamic update of SRLG values in certain scenarios, such as:
| • | Secondary priority session does not update SRLG values dynamically when it is in pseudo primary state. |
| • | Bypass session does not update SRLG values dynamically if any of its protected sessions is in using backup state. |
For more details, refer to the mpls traffic-eng srlg command section in the OcNOS Multi-Protocol Label Switching Guide, OcNOS version 7.0.1.
DHCP Relay Link Selection Dependency
DHCP Relay Link Selection functionality enforces the requirement of DHCP Option 82. When configuring a specific source IP for DHCP relay packets, the system ensures that the relay information sub-option is correctly inserted only when Option 82 is globally active.
In the ip dhcp relay information source-ip <IP address> command, enable the DHCP Relay Option 82 via the ip dhcp relay information option command. If Option 82 is not enabled, the relay agent will not insert the link selection sub-option into DHCP requests sent to the server.
Limitations
DHCP relay information options (Option 82) are not supported on downlink (relay-client-facing) interfaces.
Link selection will not be processed if the global ip dhcp relay information option is disabled.
For more details, refer to the ip dhcp relay information source-ip <IP address> section in the OcNOS System Management Guide, Release 7.0.1.