IP Router Configuration
Router Configuration Guide 141
When a packet is received in a VPRN context but is looked up in the Global Routing Table (GRT), for
example, leaking to GRT is enabled, the behavior of the TTL propagation is governed by the RSVP or
LDP shortcut configuration when the matching routing is a LSP shortcut route. It is governed by the
BGP label route configuration when the matching route is a RFC 3107 label route or a 6PE route.
When a packet is received on one VPRN instance and is redirected using Policy Based Routing (PBR)
to be forwarded in another VPRN instance, the TTL propagation is governed by the configuration of
the outgoing VPRN instance
Default vc-only
Parameters none — The TTL of the IP packet is not propagated into the VC label or labels in the transport
label stack
vc-only — The TTL of the IP packet is propagated into the VC label and not into the labels in the
transport label stack.
all — The TTL of the IP packet is propagated into the VC label and all labels in the transport label
stack.
Router L2TP Commands
Router L2TP commands only apply to the 7750 SR and 7450 ESS.
l2tp
Syntax l2tp
Context config>router
Description This command enables the context to configure L2TP parameters. L2TP extends the PPP model by
allowing Layer 2 and PPP endpoints to reside on different devices interconnected by a packet-switched
network.
calling-number-format
Syntax calling-number-format ascii-spec
no calling-number-format
Context config>router>l2tp
Description This command what string to put in the Calling Number AVP, for L2TP control messages related to a
session in this L2TP protocol instance.
Parameters ascii-spec — Specifies the L2TP calling number AVP.
Values
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