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Two easy questions on IPv6

Hi, can you help me with these basic questions:

1) I try to ping ipv6 and I get a message "output interface required". I know that informing "output interface" is expected IPv6 behavior. The problem is that the prompt for "output interface" appears and it does not give me a chance to let me type. It just errors out. What am I missing? I tried to do "ping ipv6 <> ?" and I do not see a way to inform "output interface" in the command. I am using a simulator as shown below.

2) Imagine I have the output below. Imagine I want to establish a frame-relay map with another connected router.

Is it fine and recommended if I use"frame-relay map <ipv6 link local address> instead of <ipv6 global address>?

Cisco IOS Software, Solaris Software (UNIX-JK8O3S-M), Version 12.4(15)T9,
PMENT TEST SOFTWARE
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Thu 30-Apr-09 20:48 by prod_rel_team

ROM: Bootstrap program is Solaris

R30 uptime is 30 minutes
System returned to ROM by reload
System image file is "file:///iou/iou_images/EnterprisePlus.124-15.T9"

R29#show ipv6 int s2/0
Serial2/0 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::A8BB:CCFF:FE00:1D00
  No Virtual link-local address(es):
  Global unicast address(es):
    2001::2829:A8BB:CCFF:FE00:1D00, subnet is 2001:0:0:2829::/64 [EUI]
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::5
    FF02::1:FF00:1D00
  MTU is 1500 bytes
  ICMP error messages limited to one every 100 milliseconds
  ICMP redirects are enabled
  ICMP unreachables are sent
  ND DAD is not supported
  ND reachable time is 30000 milliseconds
  Hosts use stateless autoconfig for addresses.
R29#
R29#ping ipv6 FE80::A8BB:CCFF:FE00:1D00
Output Interface:
% Interface required
R29#

3 REPLIES 3
Highlighted

hi

1- simply supply the output interface at the end of the command. For example: ping or ping ipv6 FE80::A8BB:CCFF:FE00:1D00 serial2/0

2- yes, FR should recurse to the link local address. Also if you run routing protocols, it will be essential to point to the link local address. refer to http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-frame_relay.html#wp1011425

HTH

Khalid

Highlighted
Rising star

Hello,

1> It is asking for output interface since you are trying to ping link local address. Link local address have scope pertain to that link

only, you can compare it with mac-address for link.

I have tried and it works for me

blab501#ping ipv6 FE80::290:86FF:FEA9:1580
Output Interface: POS1/0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to FE80::290:86FF:FEA9:1580, timeout is 2 seconds           :
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms

Are you sure it is ipv6 is fully supported on IOS you use

2> I advise to use global address or unique-local address and not link local address.

Hope this helps

Regards

Mahesh

Highlighted

Thanks then I see it is an IOS/simulator issue.