ipv6 LINK LOCAL ADDRESS ON ethernet vs serial

From: mani poopal (mani_ccie@yahoo.com)
Date: Tue Dec 07 2004 - 15:41:59 GMT-3


Hi Group,
 
I thought as soon as you enable ipv6(ipv6 enable command), the etherent interface assigns itself a eui64 format link local address(by appending MAC address associated). But when I enabled ipv6 on the serial interface, I am seeing the link local address same as ethernet. What is the behavior of serial interfaces(They don't have a mac address). Is it ok to enable ipv6(ipv6 enable interface mode command) on the serial interfaces. Pls look at the output. Any feedback with this new technology is appreciated.
 
R6#show ipv6 interface e 0/0
Ethernet0/0 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::2B0:64FF:FEB4:9A20 <--LINK LOCAL
  No global unicast address is configured
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::1:FFB4:9A20
  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
  ND advertised reachable time is 0 milliseconds
  ND advertised retransmit interval is 0 milliseconds
  ND router advertisements are sent every 200 seconds
  ND router advertisements live for 1800 seconds
  Hosts use stateless autoconfig for addresses.
R6#show ipv6 interface serial 0/0
Serial0/0 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::2B0:64FF:FEB4:9A20 <--LINK LOCAL
  No global unicast address is configured
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::1:FFB4:9A20
  MTU is 1500 bytes
  ICMP error messages limited to one every 100 milliseconds
  ICMP redirects are enabled
  ND DAD is not supported
  ND reachable time is 30000 milliseconds
  Hosts use stateless autoconfig for addresses.
 
 

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