IPv6 SLAAC on Switch virtual intreface

packetx

Hi guys,

(sorry for the mispelling, english is not my native language, i'm french)

I can't assign an ipv6 address using SLAAC on my 3550 switches.

SW1(config-if)#ipv6 address ?
WORD General prefix name
X:X:X:X::X IPv6 link-local address
X:X:X:X::X/<0-128> IPv6 prefix
autoconfig Obtain address using autoconfiguration

---

but----

SW1#sh ipv6 int
Vlan1 is up, line protocol is up
IPv6 is enabled, link-local address is FE80::20F:23FF:FE28:FE80
No global unicast address is configured
Joined group address(es):
FF02::1
FF02::1:FF28:FE80
MTU is 1500 bytes
ICMP error messages limited to one every 100 milliseconds
ICMP redirects are enabled
ND DAD is enabled, number of DAD attempts: 1
ND reachable time is 30000 milliseconds


I don't understand...we are on the default vlan and direct link with router1. It worked on the on the same switch PC, but not on SVI.

After a debug, when i taped the command the router1 receive the RS and send RA in response.

*Mar 1 02:36:42.951: ICMPv6-ND: Received NA for FE80::20F:23FF:FE28:FE80 on FastEthernet0/0 from FE80::20F:23FF:FE28:FE80
R1#
*Mar 1 02:36:44.951: ICMPv6-ND: Received RS on FastEthernet0/0 from FE80::20F:23FF:FE28:FE80
*Mar 1 02:36:44.951: ICMPv6-ND: Sending RA to FF02::1 on FastEthernet0/0
*Mar 1 02:36:44.951: ICMPv6-ND: MTU = 1500
*Mar 1 02:36:44.951: ICMPv6-ND: prefix = FD13:2456::/64 onlink autoconfig
*Mar 1 02:36:44.951: ICMPv6-ND: 2592000/604800 (valid/preferred)
*Mar 1 02:36:44.951: IPV6: source FE80::20D:BDFF:FEA4:AF20 (local)
*Mar 1 02:36:44.955: dest FF02::1 (FastEthernet0/0)
*Mar 1 02:36:44.955: traffic class 224, flow 0x0, len 104+1396, prot 58, hops 255, originating
*Mar 1 02:36:44.955: IPv6: Sending on FastEthernet0/0
R1#
*Mar 1 02:36:48.951: ICMPv6-ND: Received RS on FastEthernet0/0 from FE80::20F:23FF:FE28:FE80
*Mar 1 02:36:48.951: ICMPv6-ND: Sending RA to FF02::1 on FastEthernet0/0
*Mar 1 02:36:48.951: ICMPv6-ND: MTU = 1500
*Mar 1 02:36:48.951: ICMPv6-ND: prefix = FD13:2456::/64 onlink autoconfig
*Mar 1 02:36:48.951: ICMPv6-ND: 2592000/604800 (valid/preferred)
*Mar 1 02:36:48.951: IPV6: source FE80::20D:BDFF:FEA4:AF20 (local)
*Mar 1 02:36:48.955: dest FF02::1 (FastEthernet0/0)
*Mar 1 02:36:48.955: traffic class 224, flow 0x0, len 104+1396, prot 58, hops 255, originating
*Mar 1 02:36:48.955: IPv6: Sending on FastEthernet0/0
R1#
*Mar 1 02:36:52.951: ICMPv6-ND: Received RS on FastEthernet0/0 from FE80::20F:23FF:FE28:FE80
*Mar 1 02:36:52.951: ICMPv6-ND: Sending RA to FF02::1 on FastEthernet0/0
*Mar 1 02:36:52.951: ICMPv6-ND: MTU = 1500
*Mar 1 02:36:52.951: ICMPv6-ND: prefix = FD13:2456::/64 onlink autoconfig
*Mar 1 02:36:52.951: ICMPv6-ND: 2592000/604800 (valid/preferred)
*Mar 1 02:36:52.951: IPV6: source FE80::20D:BDFF:FEA4:AF20 (local)
*Mar 1 02:36:52.955: dest FF02::1 (FastEthernet0/0)
*Mar 1 02:36:52.955: traffic class 224, flow 0x0, len 104+1396, prot 58, hops 255, originating
*Mar 1 02:36:52.955: IPv6: Sending on FastEthernet0/0

but I don't see the RS coming on the interface vlan 1..
SW1(config-if)#ipv6 address autoconfig
SW1(config-if)#
*Mar 1 00:31:19.495: ICMPv6-ND: Sending NS for FE80::20F:23FF:FE28:FE80 on Vlan1
*Mar 1 00:31:19.495: IPV6: source :: (local)
*Mar 1 00:31:19.495: dest FF02::1:FF28:FE80 (Vlan1)
*Mar 1 00:31:19.495: traffic class 224, flow 0x0, len 64+16, prot 58, hops 255, originating
*Mar 1 00:31:19.495: IPv6: Sending on Vlan1
*Mar 1 00:31:20.495: ICMPv6-ND: DAD: FE80::20F:23FF:FE28:FE80 is unique.
*Mar 1 00:31:20.495: ICMPv6-ND: Sending NA for FE80::20F:23FF:FE28:FE80 on Vlan1
*Mar 1 00:31:2
SW1(config-if)#0.495: IPV6: source FE80::20F:23FF:FE28:FE80 (local)
*Mar 1 00:31:20.495: dest FF02::1 (Vlan1)
*Mar 1 00:31:20.495: traffic class 224, flow 0x0, len 72+8, prot 58, hops 255, originating
*Mar 1 00:31:20.495: IPv6: Sending on Vlan1
*Mar 1 00:31:20.495: ICMPv6-ND: Address FE80::20F:23FF:FE28:FE80/10 is up on Vlan1
SW1(config-if)#
*Mar 1 00:31:22.495: ICMPv6-ND: Sending RS on Vlan1
*Mar 1 00:31:22.495: IPV6: source FE80::20F:23FF:FE28:FE80 (local)
*Mar 1 00:31:22.495: dest FF02::2 (Vlan1)
*Mar 1 00:31:22.495: traffic class 224, flow 0x0, len 56+8, prot 58, hops 255, originating
*Mar 1 00:31:22.495: IPv6: Sending on Vlan1
SW1(config-if)#
*Mar 1 00:31:26.495: ICMPv6-ND: Sending RS on Vlan1
*Mar 1 00:31:26.495: IPV6: source FE80::20F:23FF:FE28:FE80 (local)
*Mar 1 00:31:26.495: dest FF02::2 (Vlan1)
*Mar 1 00:31:26.495: traffic class 224, flow 0x0, len 56+8, prot 58, hops 255, originating
*Mar 1 00:31:26.495: IPv6: Sending on Vlan1
SW1(config-if)#
*Mar 1 00:31:30.495: ICMPv6-ND: Sending RS on Vlan1
*Mar 1 00:31:30.495: IPV6: source FE80::20F:23FF:FE28:FE80 (local)
*Mar 1 00:31:30.495: dest FF02::2 (Vlan1)
*Mar 1 00:31:30.495: traffic class 224, flow 0x0, len 56+8, prot 58, hops 255, originating
*Mar 1 00:31:30.495: IPv6: Sending on Vlan1


So i'm wondering does a SVI can use SLAAC ? Or any known problem with 3550 switches ?


Thanks guys

clarson

3550 switches don't support ipv6. it will pass through ipv6.

packetx

thanks @clarson

After your answer, i've done a quick research and i also found that 3550 switches does not support SLAAC although the command appear in the CLI...it just don't work. it's a little bit misleading...

here the page who a guy compare 3550 and 3560 switches: http://routeswitchlabtips.com/switching/rs-ccie-home-lab-cisco-3550-vs-3560/

My next SW will definetily be a 3560