518
The packets used to verify PW connectivity are collectively referred to as VCCV packets. A PE
transfers VCCV packets through a control channel (CC).
CCs include the following types:
•
control-word
—Identifies VCCV packets through the control word (PW-ACH, PW Associated
Channel Header). You can use this CC type only when the PW supports control word. For more
information about control word, see "
."
•
router-alert
—Identifies a VCCV packet by adding an MPLS router alert label before the PW
label.
Connectivity Verification (CV) tools include the following types:
•
MPLS
ping
—Uses MPLS ping to verify PW connectivity.
•
BFD
—Uses BFD to verify PW connectivity. BFD packets use IP/UDP encapsulation (with
IP/UDP headers).
•
Raw-BFD
—
Uses BFD to verify PW connectivity. BFD packets use PW-ACH encapsulation
(without IP/UDP headers). Raw-BFD takes effect only when the CC type is
control-word
.
Configuring MPLS ping for a PW
Before you configure MPLS ping for a PW, complete the following tasks:
1.
Create a PW class, and use the
vccv cc
command to configure the VCCV CC type in PW class
view.
2.
Create the PW, and reference the PW class created in the previous step for the PW.
Perform the following task in any view:
Task Command
Use MPLS ping to verify the
connectivity of a PW.
ping mpls
[
-a
source-ip
|
-c
count
|
-exp
exp-value
|
-h
ttl-value
|
-m
wait-time
|
-r
reply-mode
|
-rtos
tos-value
|
-s
packet-size
|
-t
time-out
|
-v
]
*
pw
ip-address
pw-id
pw-id
Configuring BFD for a PW
Follow these steps to configure BFD for a PW:
1.
Enable BFD for MPLS.
2.
Create a PW class, and configure BFD for PW connectivity verification in PW class view.
3.
Create the PW, and reference the PW class created in the previous step for the PW.
If both PEs of the PW have configured BFD and use the same BFD packet encapsulation type, the
PEs use the specified encapsulation type to verify PW connectivity. Otherwise, the PEs do not use
BFD to verify PW connectivity.
If both PEs have specified the same VCCV CC type, the specified VCCV CC type is used. Otherwise,
the PEs do not use any CC and they cannot establish a BFD session for the PW.
Configuring BFD for an MPLS L2VPN PW
Perform this task to use BFD to verify the connectivity of a static PW or an LDP PW of MPLS L2VPN:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enable BFD for MPLS.
mpls bfd enable
By default, BFD for MPLS is
disabled.
Содержание HPE FlexNetwork MSR Router Series
Страница 10: ...viii Index 540 ...