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Inter-AS Topology
When an L3VPN ping or trace is transmitted, the
TTL value on the inner (VPN) label is set to 1 by default. This value
causes the TTL to expire on the egress PE of the L3VPN LSP and an
echo reply can be sent back to the source. However, in an inter-AS
topology, this behavior might result in premature termination of the
ping or trace. You can use the bottom-label-ttl keyword to avoid this problem.
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