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MPLS and RSVP-TE
The link-protect LFA backup next hop for an adjacency SID can be programmed at
the ingress LER and LSR nodes (as explained in
A maximum of 12 labels, including all transport (including entropy), service, NGE,
and OAM labels, can be pushed. The label stack size for the SR-TE LSP can be 1 to
11 labels, with a default value of 6.
The label stack size manipulation includes the following LER and LSR roles:
An example of the label stack pushed by the ingress LER and by an LSR acting as
a PLR is illustrated in
SR-TE LSP Label Stack Programming
Figure 13
BC-SID=1001
CD-SID=1002
BGP-LBL (D)
SVC-LBL (X)
A
Node SID=50
Adj-SID:
IGP Metric:
TE Metric:
C-SID=70
CD-SID=1002
BGP-LBL (D)
SVC-LBL (X)
PKT
On node A, the user configures an SR-TE LSP to node D with a list of explicit strict
hops mapping to the adjacency SID of links A-B, B-C, and C-D.
116
• LER role:
- push up to 12 labels depending on the service type
- pop up to 8 labels
• LSR role:
- pop up to 5 labels and swap 1 label for a total of 6 labels
- LSR hash of a packet with up to 10 labels
Figure
PKT
B
Node SID=60
1000
10
10
60
CD-SID=1002
Adj-SID:
3000
IGP Metric:
10
TE Metric:
10
90
E
Node SID=90
Use subject to Terms available at: www.nokia.com
13.
CD-SID=1002
BGP-LBL (D)
SVC-LBL (X)
PKT
Node SID=70
Adj-SID:
1001
IGP Metric:
100
TE Metric:
10
C-SID=70
Adj-SID:
3001
IGP Metric:
10
BGP-LBL (D)
TE Metric:
10
SVC-LBL (X)
PKT
Adj-SID:
2000
IGP Metric:
10
TE Metric:
10
Node SID=100
© 2022 Nokia.
SR-TE LSP
Protection).
BGP-LBL (D)
SVC-LBL (X)
PKT
C
Node SID=80
Adj-SID:
1002
IGP Metric:
100
TE Metric:
10
70
100
Adj-SID:
2001
IGP Metric:
10
TE Metric:
10
F
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MPLS Guide
D
80
27873
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