[c-nsp] IPV6 Path MTU DIscovery Test

[Xu Hu]

Hi Experts,

I have some queries about the PMTU for IPv6.
1. From my understanding, path MTU discovery in IPv6 allows a host to
dynamically discover and adjust to differences in the MTU size of every
link along a given data path, So the fragmentation is handled by the
source, if i want to test this feature in the IPv6 network, anyone have any
good ideas?
For example, as below topology, if i want to test the Path MTU discovery,
how to test, i can ping from CE-1  to CE--2 with a specific IPv6 packet
size.
CE-1------PE-1------------PE-2--------CE-2

2. If i need to configure the Path MTU discovery, just one command
mentioned in Cisco.com, which is "ipv6 flowset" under configuration mode.
So if i want to disable that in test scenario, just using the "no ipv6
flowset" is okay? Cisco don't mentioned that.
By default, it is enable for ip routers or not?

Thanks for any inputs.

Best Regards,
Hu Xu