Junos® OS Ethernet Interfaces Configuration ... - Juniper Networks

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OS 12.3 Ethernet Interfaces Configuration Guide
Figure 23: CET inter-op Dual Attached Topology
A-x200
Customer
Site
Customer
Site
MX-P
MX-P
A-x200 MX-PE MX-PE
A-4100
A-x100
A-x100
E-Domain MPLS Core A-Domain
A-x200 MX-PE A-4100
A-x100
A-x100
Customer
Site
Level 0 down MEP to Monitor working path
Level 0 down MEP to Monitor protect path
Customer
Site
Figure 23 on page 222 describes the dual attached topology on MX Series PE routers
connected to the A-domain. The MAC flush mechanism used in this case is also the same
as the one used for the A-domain in the dual homed scenario (Figure 1). However in this
case both the CFM sessions are hosted by only one MX Series PE router. When Ax100 in
the A-domain detects topology changes, the MX Series PE router receives the connection
protection TLV in the CCM message for the working and protection paths with the value
of “Protection-in-use” indicating which path is the active one. Based upon the event that
is generated for the CFM session, the MX Series PE router will bring down the appropriate
interface which will trigger a local MAC flush.
Configuring a Connection Protection TLV Action Profile
222
Related
Documentation
An action profile can be configured to perform the interface-down action based on the
values of connection-protection-tlv in the received CCM packets.
The following example shows an action profile configuration with explanatory comments
added:
•
[edit protocols oam ethernet connectivity-fault-management]
action-profile {
event {
# If a connection protection TLV with a “Protection-in-use” value of SET is received */
connection-protection-tlv ;
# If a connection protection TLV with a “Protection-in-use” value of RESET is received
*/
connection-protection-tlv ;
}
action {
# Bring the interface down */
interface-down;
}
}
connection-protection-tlv
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