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[staticroutebfd] fix ipv6 letter case issue (#15765)
*use lower case for IPv6 address as internal key and bfd session key. fixes #15764 Why I did it *staticroutebfd uses the IPv6 address string as a key to create bfd session and cache the bfd sessions using it as a key. When the IPv6 address string has uppercase letter in the static route nexthop list, the string with uppercase letter key is stored in the cache, but the BFD STATE_DB uses lowercase for IPv6 address, so when the staticroutebfd get the bfd state event, it cannot find the bfd session in its local cache because of the letter case.
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