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Webcast-Catalyst9k
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can reserved ipv6 multicast addresses can be learnt

In general, can reserved ipv6 multicast addresses can  be learnt on a switch ? Additionally is ff02::1:1 a reserved ipv6 address?

For example reserved multicast addresses for RIP6 and OSPF3 are learnt with MLD enabled. Is this an allowed behaviour?

kindly help on this.

thanks

Rajesh kumar V

Everyone's tags (3)
1 REPLY
Cisco Employee

Re: can reserved ipv6 multicast addresses can be learnt

Hi Rajesh,

MLD is used for all multicast addresses except for ff02::1 as stated in rfc3810, section 6.

   The link-scope all-nodes multicast address, (FF02::1), is handled as
   a special case.  On all nodes -- that is all hosts and routers,
   including multicast routers -- listening to packets destined to the
   all-nodes multicast address, from all sources, is permanently enabled
   on all interfaces on which multicast listening is supported.  No MLD
   messages are ever sent regarding neither the link-scope all-nodes
   multicast address, nor any multicast address of scope 0 (reserved) or
   1 (node-local).

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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