Hello Görgen!
Thanks for testing that out and sharing your results, it’s always useful for readers of the forum.
I tried the same thing on my CML environment and got the same error message as you. Investigating a little further, I found that the command in this particular switch does not accept an EtherType number, but only keywords like so:
SW1(config)#mac access-list extended NO-IPV6
SW1(config-ext-macl)#permit any any ?
aarp EtherType: AppleTalk ARP
amber EtherType: DEC-Amber
appletalk EtherType: AppleTalk/EtherTalk
dec-spanning EtherType: DEC-Spanning-Tree
decnet-iv EtherType: DECnet Phase IV
diagnostic EtherType: DEC-Diagnostic
dsm EtherType: DEC-DSM
etype-6000 EtherType: 0x6000
etype-8042 EtherType: 0x8042
lat EtherType: DEC-LAT
lavc-sca EtherType: DEC-LAVC-SCA
mop-console EtherType: DEC-MOP Remote Console
mop-dump EtherType: DEC-MOP Dump
msdos EtherType: DEC-MSDOS
mumps EtherType: DEC-MUMPS
netbios EtherType: DEC-NETBIOS
vines-echo EtherType: VINES Echo
vines-ip EtherType: VINES IP
xns-idp EtherType: XNS IDP
<cr>
SW1(config-ext-macl)#permit any any
I am using the exact same version as you. It seems that the EtherTypes that you can use are limited to these particular ones, and it doesn’t include IPv6. Take a look at this Cisco command reference that describes the command with many more options than those shown above:
I believe it is a limitation of the specific IOS version.
I hope this has been helpful!
Laz