Nokia MPLS case studies
Nokia MPLS · Put your knowledge to work in context.
The Nokia MPLS exam is an independent, multiple-choice knowledge assessment for network engineers who work with Nokia IP/MPLS transport solutions. It is aimed at design, deployment, and operations staff who need to demonstrate breadth across the transport portfolio that Nokia presents to telecommunication providers: IP routing, switching and aggregation; IP network automation through the Network Services Platform; IP network security; and optical transport with data center interconnect. The Nokia MPLS case studies are 5 cases and about 4,395 words.
1OSPF ExStart and a PMTUD black hole after a DCI recabling
A regional operator runs IS-IS level 2 in its core and OSPFv2 in an aggregation domain built on seven 7250 IXR-R6 routers and two 7750 SR-12 PEs. During a data-center interconnect upgrade, all core links were re-cabled for 9,214-byte frames and the IXR interfaces were set to MTU 9214.
906 words, about 5 min2Duplicated BUM traffic after a PE reboot in an EVPN all-active multihomed service
An operator aggregates 240 business access switches onto a pair of 7750 SR-7 PEs using EVPN-MPLS all-active multihoming. Every access switch is dual-homed with one LACP bundle (ESI 00:11:22:33:44:55:00:01) to PE-A and PE-B and belongs to a VPLS service with EVPN.
937 words, about 5 min3Reconciling 61 drifted nodes in NSP after an incident workaround
An operator manages 420 SR OS nodes with Nokia NSP: 7750 SR and 7250 IXR in the core, 7210 SAS at the edge. Six months ago the team standardized on 12 configuration templates pushed through NSP, with state collected every 15 minutes through gNMI where the release supports it and SNMP elsewhere.
822 words, about 4 min4RPKI, CPM filtering and management-plane cleanup in one maintenance window
A security audit of a 900-node MPLS network found: all iBGP and eBGP sessions use TCP MD5 only; two eBGP sessions to a transit provider carry the full IPv4 table (about 950,000 prefixes) with no maximum-prefix limit; SNMPv2c with community public is enabled on 60 nodes; Telnet is enabled on 12 legacy 7210 SAS; CPM filters exist on only four core PEs and each ends with an implicit default permit. The operator must deploy RPKI origin validation within 30 days without dropping customer traffic.
863 words, about 4 min5400G per wavelength on a 610 km nine-span DCI with no regeneration
Two data centers 610 km apart must be connected with a new DCI system. The route has nine spans averaging 68 km; seven spans are SMF-28 with 0.22 dB/km attenuation and two are older fiber with 0.25 dB/km.
867 words, about 4 min