Manual Bypass Tunnel For Frr Configuration Example - HP HPE FlexNetwork MSR Router Series Configuration Manual

Fast Reroute protection: None
# Tracert MPLS TE tunnel 3. The output shows that the used CRLSP is the one that traverses Router
B.
[RouterA] tracert mpls te tunnel 3
MPLS trace route TE tunnel Tunnel3
TTL Replier
0
1 10.1.1.2
2 20.1.1.2
# Shut down interface GigabitEthernet 2/0/2 on Router B, and then tracert tunnel 3. The output
shows that packets are forwarded on the CRLSP that traverses Router D.
[RouterA] tracert mpls te tunnel 3
MPLS trace route TE tunnel Tunnel3
TTL Replier
0
1 30.1.1.2
2 40.1.1.2
# Execute the display mpls lsp command on Router A. The output shows that only one CRLSP
exists on the router.
[RouterA] display mpls lsp
FEC
1.1.1.9/3/34313
30.1.1.2
Tunnel3
# Execute the display ip routing-table command on Router A. The output shows a static route entry
with interface Tunnel 3 as the output interface. (Details not shown.)

Manual bypass tunnel for FRR configuration example

Network requirements
On the primary CRLSP Router A—Router B—Router C—Router D, use FRR to protect the link
Router B—Router C.
Use RSVP-TE to establish the primary CRLSP and bypass tunnel of the MPLS TE tunnel based on
the constraints of the explicit paths. The bypass tunnel uses path Router B—Router E—Router C.
Router B is the PLR and Router C is the MP.
Configure BFD for RSVP-TE between Router B and Router C. When the link between Router B and
Router C fails, BFD can detect the failure quickly and notify RSVP-TE of the failure, so RSVP-TE can
switch traffic to the bypass tunnel.
Time Type Downstream
Ingress 10.1.1.2/[1147]
1 ms Transit 20.1.1.2/[3]
2 ms Egress
Time Type Downstream
Ingress 30.1.1.2/[1148]
2 ms Transit 40.1.1.2/[3]
3 ms Egress
Proto In/Out Label
RSVP -/1150
Local -/-
Local -/-
138
Interface/Out NHLFE
POS2/2/1
POS2/2/1
NHLFE1029