Identifies the format, scale, advertisement, protection, and Flex-Algo limitations that must be considered when deploying uSID and anycast locators.
Limitations for uSID locators
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Cisco IOS XR supports uSIDs with 32-bit uSID blocks and 16-bit uSID IDs (3216). You must use a single UCF format for uSID locators in an SRv6 uSID domain.
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Cisco IOS XR supports up to 16 uSID locator prefixes. Configure multiple locator prefixes when using anycast locators or SRv6 Flexible Algorithm instances.
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Cisco IOS XR supports uSID locator prefixes from different uSID blocks. You can configure up to 256 uSID blocks across all uSID locators in the network.
Limitations for anycast locators
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ISIS: Unlike a normal locator, IS-IS does not program or advertise uA SIDs associated with an anycast locator.
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TI-LFA backup: uN SIDs allocated from anycast locators will not be used in constructing TI-LFA backup paths or Microloop Avoidance primary paths. TI-LFA backup and Microloop Avoidance paths for an Anycast locator prefix may terminate on any node advertising that locator, which may be different from the node terminating the original primary path.
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Flexible algorithm: SRv6 anycast locators may have non-zero algorithm (Flexible Algorithm) values.