Srlsp Setup - H3C SR6600 Command Reference Manual

flooded information, the other devices in the domain calculates their local label forwarding
entries by using the following rules:
Incoming label = Local SRGB base value + Index

Outgoing label = SRGB base value of the next hop + Index

Figure 1 Creating label forwarding entries based on prefix SIDs
In Label Nexthop
16201 Device B
SRGB Base
Figure 1 shows how dynamic label forwarding entries are created. After you assign index value 201
to loopback address 1.1.1.1/32 on Device C, Device C uses an IGP packet to advertise the index
value and its local SRGB. Then, the devices calculate incoming and outgoing labels according to the
previously mentioned label calculation rules.
•
Devices C calculates its incoming label, which is 18201.
•
Device B calculates its incoming label and outgoing label and creates a label forwarding entry.
The incoming label is 17201. The outgoing label is 18201. The next hop is Device C.
•
Device A calculates its incoming label and outgoing label and creates a label forwarding entry.
The incoming label is 16201. The outgoing label is 17201. The next hop is Device B.
Label forwarding entry installation based on adjacency SIDs
When using adjacency SIDs, each device allocates a static or dynamic incoming label to the link to
its neighbor. The label has local significance. Multiple devices can use the same adjacency SID.
Figure 2 Creating label forwarding entries based on adjacency SIDs
In Label Nexthop
203 Device B
Device A
As shown in
between the devices, Device A, Device B, and Device C allocates labels and creates label
forwarding entries as follows:
•
Device A allocates label 203 to the link to its neighbor Device B.
•
Device B allocates label 202 to the link to its neighbor Device C.
•
Device C allocates label 201 to the link to its neighbor Device D.
•
Device A creates a label forwarding entry with incoming label 203 and next hop Device B.
•
Device B creates a label forwarding entry with incoming label 202 and next hop Device C.
•
Device C creates a label forwarding entry with incoming label 201 and next hop Device D.

SRLSP setup

You can use the following methods to create SRLSPs:
•
Manually configure an SRLSP.
Out Label In Label
17201 17201
Device A
Range
16000 1000
In Label
202
Device B
Figure 2, the devices are running the same IGP. After IGP adjacencies are established
Nexthop Out Label
Device C 18201
Device B
SRGB Base Range
17000 1000
Nexthop In Label
Device C 201
Device C
3
In Label
18201
1
. 1
. 1
. 1
/ 3 2
Device C
SRGB Base Range
18000 1000
Nexthop
Device D
Device D
p
o
201
o
L
0