GRE TUNNEL IN IPV6

alsayed · ‎02-21-2009

hello

when we use Lsa type 4?and what's the need for GrE tunnel in ipv6?

thanks

Mohamed Sobair · ‎02-21-2009

Hi,

The LSA type 4 is generated by ABRs and describes reachability to the ASBR.

The GRE Tunnels in IPv6 provides connectivity between 2 or More IPv6 Networks over IPv4, In MPLS it's being implemented because MPLS doesnt support IPv6 natively yet.

There are multiple ways 2 carry IPv6 Over MPLS:

1- 6PE.

2- 6VPE.

3- AToM (The payload is layer-2 Frames).

2- MPLS VPN Solution: This solution uses GRE Tunneling to carry IPv6 Over MPLS-VPN, The tunneling techniqes are:

1- 6to4.

2- IPv6 Over IP.

3- IPv4 compatible IPv6 Tunnels.

HTH

Mohamed

alsayed · ‎02-21-2009

hello mohamed

thanks but when we use it?

Mohamed Sobair · ‎02-21-2009

Hi,

You use it when you have 2 Or more IPv6 Domains needs to be connected over abn IPv4 or MPLS domains.

HTH

Mohamed

alsayed · ‎02-21-2009

i mean the lsa 4

Harold Ritter · ‎02-21-2009

Ali,

As I responded on another post, an LSA type 4 is generated automatically by all ABRs (except the area where the ASBR lives or stubby areas) for each an every ASBR. They are used to calculate reachability to the ASBR.

Regards

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
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