Hi, Sri
I have some commons about the GRE tunnel type in this alt-tunnel draft.
In the current draft, several kinds of tunnel types are listed:
Tunnel-Type Type Value Reference
CAPWAP 0
[RFC5415<https://tools.ietf.org/html/rfc5415>],[RFC5416<https://tools.ietf.org/html/rfc5416>]
L2TP 1
[RFC2661<https://tools.ietf.org/html/rfc2661>]
L2TPv3 2
[RFC3931<https://tools.ietf.org/html/rfc3931>]
IP-IP 3
[RFC2003<https://tools.ietf.org/html/rfc2003>]
PMIPv6 4
[RFC5213<https://tools.ietf.org/html/rfc5213>]
GRE-IPv4 5
[RFC2784<https://tools.ietf.org/html/rfc2784>]
GRE-IPv6 6
[RFC2784<https://tools.ietf.org/html/rfc2784>]
And it is said that
This
specification provides details for this elements for CAPWAP and
PMIPv6.
What I suggest is that this specification should also refer to
GRE-IPv4/v6.
I think not too many modifications are needed. Just add a new session:
3.6<https://tools.ietf.org/html/draft-ietf-opsawg-capwap-alt-tunnel-06#section-3.5>.
GRE based Alternate Tunnel
GRE can also be used
for alternate tunnel encapsulation between the WTP and the AR.
o Access Router Information: IP address or Fully
Qualified Domain Name (FQDN) for the alternate tunnel endpoint.
o GRE Key: optional, defined in rfc2890.
The message element structure for GRE encapsulation is shown in
Figure 11:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Tunnel-Type=5 or 6 | Info Element Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
. Access Router Information Element .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
. GRE Key Element .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 11: Alternate Tunnel Encapsulation - GRE
Fortunately, we do not need to explain what the GRE key element is
because there is already this explanation in the current draft "3.6.6. GRE Key
Element".
I used to join in the work of this draft. I think we have taken this
GRE type into consideration, but I do not know why it is missing now.
What I means is that GRE type should not be considered in other drafts
as L2TP or IP-IP, because GRE is a widely used and important tunnel type in
WiFi network.
So I suggest to add GRE tunnel type into this draft just as the CAPWAP
and PMIP tunnel type.
Best wishes
Zongpeng Du
_______________________________________________
OPSAWG mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/opsawg
