SR-MPLS - SRTE Traffic Steering (per destination)


Traffic engineering is a key use case of SR-MPLS, allowing operators to steer selected traffic flows over non-shortest paths for load balancing or policy reasons. We executed SR-TE traffic steering over the SR-MPLS test by selecting a forwarding path that differed from the IS-IS shortest path. For each run, we rotated the Device Under Test (DUT) through the systems listed in the Table below while keeping the remaining nodes fixed, and we configured a static SR policy on the headend toward the destination using a specific color to steer traffic over the longer path in the SR-MPLS domain. We then advertised the relevant routes with a BGP color extended community so that the headend matched the traffic to the SR-TE policy. With the color present, traffic followed the SR-TE path as intended and did not use the IGP-preferred path. For testing the fallback, we removed the color from the route advertisement and confirmed that the traffic reverted to the normal IGP shortest path. This verified that policy-based steering was applied only when the BGP color matched the SR policy, and that forwarding returned to IGP when the steering signal was withdrawn.

Figure 66

Figure 66: SR-MPLS - SR-TE Traffic Steering (per destination)

HeadendTraffic Generator
Arista 7280R3Keysight IxNetwork
HPE ACX7100-48LKeysight IxNetwork
Nokia 7730 SXR-1x-44sKeysight IxNetwork
Nokia 7750 SR-1Keysight IxNetwork
Rbbn NPT-2507Keysight IxNetwork
ZTE ZXCTN  6120H-SKeysight IxNetwork
ZTE ZXR10 M6000-2S16Keysight IxNetwork
ZTE ZXR10 M6000-4SEKeysight IxNetwork
Raisecom iTN8800-AKeysight IxNetwork

Table 36: SR-MPLS - SRTE Traffic Steering (per destination) - per destination

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