IPV6同设备不同网段，使用-a ping测试为何ttl不减

如题

下面PC（地址2001:DA8:4017:9002:F885:F9FF:FE72:F501）没有配置IPV6网关，在核心交换机上通过Ping -a测试，依旧能通，且TTL依旧是64，按道理指定了-a源，TTL应该会减1才对，而且也不应该能Ping通啊，有点儿想不明白

[Core-10508X]dis ipv6 interface brief 

*down: administratively down

(s): spoofing

Interface         Physical Protocol IPv6 Address/Prefix VPN instance Description

FGE1/2/0/2        up       up       2001:DA8:4017:1::1/64 --           HL

FGE1/3/0/23       up       up      2001:DA8:4017:9002::1/64     --  Test

...

[Core-10508X]ping ipv6 -a 2001:DA8:4017:1::1 2001:DA8:4017:9002:F885:F9FF:FE72:F501

Ping6(56 data bytes) 2001:DA8:4017:1::1 --> 2001:DA8:4017:9002:F885:F9FF:FE72:F501, press CTRL+C to break

56 bytes from 2001:DA8:4017:9002:F885:F9FF:FE72:F501, icmp_seq=0 hlim=64 time=3.731 ms

56 bytes from 2001:DA8:4017:9002:F885:F9FF:FE72:F501, icmp_seq=1 hlim=64 time=3.700 ms

56 bytes from 2001:DA8:4017:9002:F885:F9FF:FE72:F501, icmp_seq=2 hlim=64 time=3.457 ms

56 bytes from 2001:DA8:4017:9002:F885:F9FF:FE72:F501, icmp_seq=3 hlim=64 time=3.871 ms

56 bytes from 2001:DA8:4017:9002:F885:F9FF:FE72:F501, icmp_seq=4 hlim=64 time=3.559 ms