From: Moin, Imran (imoin@virtela.net)
Date: Sat Feb 19 2005 - 17:22:28 GMT-3
Besides the point mentioned below, GRE tunnels can be configured with
keepalives which means that they will send link-down SNMP traps when the
tunnel goes down. This helps in identify problems faster for production
networks.
IP in IP tunnels are always up/up, even if the actual tunnel is down and not
passing traffic. These problems are harder to detect, especially if you have
redundant paths and traffic fails over to the other path.
Thanks,
Imran Moin
Senior Network Engineer
Virtela Communications
Voice: +1 720-475-4170
Fax: +1 720-475-4171
Email: imoin@virtela.net
-----Original Message-----
From: bi.s [mailto:bi.s@gmx.net]
Sent: Saturday, February 19, 2005 8:32 AM
To: Amit Jain
Cc: 'ccielab@groupstudy.com'
Subject: Re: Diff b/t GRE and IPIP
Amit Jain wrote:
> Hi
>
> Please help me in understanding the situations where I will use IP in
> IP encapsulation on the tunnel rather then GRE. My understanding says
> that "vendor independance" in one. What is the "real" difference in
> two tunnel modes ?
>
IPinIP can only transport IP packets.
GRE is multiprotocol and can transport e.g. CLNS.
hth
/b
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