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  1. Junior Member
    Join Date
    Feb 2017
    Posts
    11
    #1

    Exclamation IPv6 SLAAC on Switch virtual intreface

    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
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  3. Senior Member
    Join Date
    Sep 2014
    Location
    Minnesota
    Posts
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    Certifications
    CCNA:R&S, VCA6-DCV, Sec+
    #2
    3550 switches don't support ipv6. it will pass through ipv6.
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  4. Junior Member
    Join Date
    Feb 2017
    Posts
    11
    #3
    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/switch...-3550-vs-3560/

    My next SW will definetily be a 3560
    Last edited by packetx; 08-05-2017 at 01:16 AM.
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