CCNP SP · SEGMENT ROUTING

Segment routing with IS-IS

Replace label distribution by LDP with segment routing. IS-IS already runs on all five routers. Give each router a prefix-SID on its Loopback0 (index = router number) and turn segment routing on in IS-IS. Every router then programs label 16000 + index toward each loopback, and PE1 reaches PE2 on an SR label-switched path, with no LDP anywhere.

CCNP SP track · Cisco · 5 objectives

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Objectives

The simulator ticks each one as soon as the network meets it.

On every router enable segment-routing mpls, and under router isis enable segment-routing mpls with segment-routing prefix-sid-map advertise-local.
Map each Loopback0 to its SID in connected-prefix-sid-map: 1.1.1.1/32 index 1 range 1 on PE1, and so on.
All five routers run SR and every loopback has its own SID (show segment-routing mpls connected-prefix-sid-map ipv4).
PE1 has label 16005 toward PE2 (show mpls forwarding-table), and P1 pops it (PHP).
PE1’s LSP to 5.5.5.5 uses segment routing; ping 5.5.5.5 from PE1.

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