3Com S7902E, Руководство по настройке

Страница: 1463 / 2621

1-29
z
Configure the
ttl propagate vpn
command on all relevant PEs to allow IP TTL propagation of VPN
packets.
z
Configure the
undo ttl expiration pop
command on the ASBRs and SPEs to assure that ICMP
responses can travel along the original LSPs.
z
SPE refers to superstratum PE or service provider-end PE.
z
For details about HoVPN, refer to
MPLS L3VPN Configuration
in the
MPLS Volume
.
Follow these steps to specify the type of the paths for ICMP responses:
To do… Use the command… Remarks
Enter system view
system-view
—
Enter MPLS view
mpls
—
Enable to send ICMP error
messages when the TTL of an
MPLS packet expires
ttl expiration enable
Optional
Enabled by default.
Specify that ICMP responses
travel along the IP route when
the TTL of an MPLS packet
expires
ttl expiration pop
Specify that ICMP responses
travel along the LSP when the
TTL of an MPLS packet expires
undo ttl expiration pop
Optional
Configure one of them as
required.
By default, ICMP response
messages of an MPLS packet
with a one-level label stack
travel along the IP route.
ICMP response messages of
an MPLS packet with multiple
levels of labels always travel
along the LSP when the TTL of
such packet expires.
Configuring MPLS Statistics
Setting the Interval for Reporting Statistics
To view LSP statistics, you need to set the interval for collecting statistics at first.
Follow these steps to set the interval for collecting statistics:
To do… Use the command… Remarks
Enter system view
system-view
—
Enter MPLS view
mpls
—
Set the interval for collecting
statistics
statistics interval interval-time
Required
0 seconds by default, meaning
that the system does not collect
statistics.