Wholesale-Retail — L2TP Tunneled Access Mode
Page 60 7750 SR RADIUS Attributes Reference Guide
69 Tunnel-Password A shared, salt encrypted, secret used for tunnel authentication and
AVP-hiding. The usage of tunnel-authentication is indicated by
attribute [26-6527-97] Alc-Tunnel-Challenge and the usage of AVP-
hiding is indicated by attribute [26-6527-54] Alc-Tunnel-AVP-
Hiding. The value with tag 0 is used as default for the tunnels where
the value is not specified. Pre-configured values are used when
attribute is omitted (configure router/service vprn <service-id>
l2tp password). There is no default password. Received passwords
longer than the maximum chars limit are truncated at maximum
chars limit.
81 Tunnel-Private-Group-ID The group ID for a particular tunnelled session. This RADIUS
attribute is copied by a 7750 LAC in AVP 37 - Private Group ID
(ICCN) and is used by the LAC to indicate that this call is to be
associated with a particular customer group. The 7750 LNS ignores
AVP 37 when received from LAC. The value with tag 0 is used as
default for the tunnels where the value is not specified. String lengths
above the maximum value are treated as setup failures.
82 Tunnel-Assignment-ID Indicates to the tunnel initiator the particular tunnel to which a
session is to be assigned. Some tunnelling protocols, such as PPTP
and L2TP, allow for sessions between the same two tunnel endpoints
to be multiplexed over the same tunnel and also for a given session to
utilize its own dedicated tunnel. Tag-0 Tunnel-Assignment-ID:0
string, has a special meaning and the string becomes the Tunnel-
group name that can hold up to maximum 31 tunnels with the name
Tunnel-Assignment-ID-[1..31] string. A Tunnel-group with the name
default_radius_group is created on the LAC when this attribute with
tag-0 is omitted. This attribute is not the same as attribute 26-4874-
64 ERX-Tunnel-Group or 26-6527-46 Alc-Tunnel-Group since these
attributes both refer to a tunnel-group name created in CLI context.
When not specified, the default value for Tunnel-Assignment-ID-
[1..31] string is unnamed. String lengths above the limits are treated
as a setup failure.
83 Tunnel-Preference Indicates the relative preference assigned to each tunnel if more than
one set of tunnelling attributes is returned by the RADIUS server to
the tunnel initiator. 0x0 (zero) being the lowest and
0x0FFFFFF(16777215) being the highest numerical value. The
tunnel having the numerically lowest value in the Value field of this
Attribute is given the highest preference. Other tunnel selection
criteria are used if preference values from different tunnels are equal.
Preference 50 is used when attribute is omitted. Values above the
Limits wrap around by Freeradius before send to the NAS (start
again from zero until the Limits).
Table 8: Wholesale-Retail: L2TP Tunneled Access Mode (description) (Continued)
Attribute ID Attribute Name Description
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