Difference between revisions of "Static Routes IPv6 Cisco IOS"
From Teknologisk videncenter
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When configuring static Routes in IPv6 it is not recommended to use ''global unicast'' addresses as next-hop address. Use Link-local adresses. | When configuring static Routes in IPv6 it is not recommended to use ''global unicast'' addresses as next-hop address. Use Link-local adresses. | ||
| − | {{Technote|heading=extract from | + | {{Technote|heading=extract from {{rfc|rfc=2461}} |
|A router must be able to determine the link-local address of each of its neighboring routers in order to ensure that the target address of a Redirect message identifies the neighbor router by its link-local address. | |A router must be able to determine the link-local address of each of its neighboring routers in order to ensure that the target address of a Redirect message identifies the neighbor router by its link-local address. | ||
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ipv6 address FE80:16D8:DD85:B280::2 link-local | ipv6 address FE80:16D8:DD85:B280::2 link-local | ||
</source> | </source> | ||
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=Links= | =Links= | ||
*[http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-stat_routes.html Cisco IPv6 static Rotues] | *[http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-stat_routes.html Cisco IPv6 static Rotues] | ||
Revision as of 07:45, 17 December 2011
The basic syntax for configuring IPv6 statis routes is the same as in IPv4
- IPv4
- ip route [ipv4_prefix][ipv4_address_mask][ipv4_if_address]
- IPv6
- ipv6 route [ipv6_prefix/prefix_length][ipv6_if_address]
- Ex: ipv6 route ::/0 FastEthernet0/1 FE80::206:2AFF:FEa0:ce84
Next Hop address
When configuring static Routes in IPv6 it is not recommended to use global unicast addresses as next-hop address. Use Link-local adresses.
 |
A router must be able to determine the link-local address of each of its neighboring routers in order to ensure that the target address of a Redirect message identifies the neighbor router by its link-local address. |
| extract from rfc2461 |
Link-local addresses however uses EUI-64 based on the Routers MAC-address. If the Router is replaced the neighboring Routers will have to be reconfigured with the new Link-local address. How to avoid this mess I do not know. When configuring IPv6 addresses on Router interfaces I set the Link-local IPv6 address to match the Global unique IPv6 address. See example below.
interface FastEthernet1/0
ipv6 address 2001:16D8:DD85:B280::2/64
ipv6 address FE80:16D8:DD85:B280::2 link-local