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Multi-vendor troubleshooting lab 9 of 12

IPv6 interoperability with RA flags DHCPv6 and OSPFv3

Larkfield turns on IPv6 and two sites stay dark. OSPFv3 needs matching instance IDs and a firewall that lets it in, one LAN's router advertisements tell hosts to use a DHCPv6 service that can't be reached, and another advertises no prefix at all. Fix each one and read the flags from the host's side.

Run this lab

It needs Lite: its 5 nodes are set to 6 vCPU and 7,424 MB in total. That fits the free demo too.

In your workspace: Shared, then Multi-vendor interoperability and troubleshooting guided labs, then 09 - IPv6 interoperability with RA flags DHCPv6 and OSPFv3

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Level
Advanced
Time
About 80 minutes
Nodes need
6 vCPU, 7,424 MB
Smallest plan
Lite

The scenario

Larkfield is turning on IPv6 between its sites, and OSPFv3 should carry every prefix. H1 is a test PC with one network card on each access LAN. LAN A has an Arista gateway, and hosts there must get their addresses from the central DHCPv6 server on R1. LAN B has a MikroTik gateway, and hosts there use SLAAC. Today neither LAN gets a global address it can use, and half the routers can't see each other.

DeviceInterfaceAddressConnects to
R1Gi0/02001:db8:12::1/64SRX1 ge-0/0/0
R1Gi0/12001:db8:14::1/64CHR1 ether2
R1Loopback02001:db8:ff::1/128DHCPv6 server
SRX1ge-0/0/0.02001:db8:12::2/64R1
SRX1ge-0/0/1.02001:db8:23::1/64EOS1
SRX1lo0.02001:db8:ff::2/128Router ID 10.255.0.2
EOS1Ethernet12001:db8:23::2/64SRX1
EOS1Ethernet22001:db8:a::1/64LAN A, H1 eth0
EOS1Loopback02001:db8:ff::3/128Router ID 10.255.0.3
CHR1ether22001:db8:14::2/64R1
CHR1ether32001:db8:b::1/64LAN B, H1 eth1
CHR1loopback2001:db8:ff::4/128Router ID 10.255.0.4
Design standardValue
OSPFv3Area 0, instance ID 0, point-to-point between routers
LAN AM flag set, A flag clear: addresses from DHCPv6 through a relay on EOS1
LAN BSLAAC: prefix advertised with the A flag set

What you’ll practise

  • Read OSPFv3 state on IOS, Junos, EOS and RouterOS
  • Match OSPFv3 instance IDs between vendors
  • Allow OSPFv3 through a vSRX zone
  • Read M, O and A flags, and predict what a host will do
  • Relay DHCPv6 from one vendor to a server on another
  • Fix a RouterOS LAN that sends router advertisements with no prefix

The tasks

  1. Prepare H1
  2. Read the state
  3. The OSPFv3 instance ID
  4. OSPFv3 through a zone
  5. LAN B, advertisements with no prefix
  6. LAN A, a promise nobody keeps

The Lab Tasks pane has the scenario, these tasks, the checks to run, hints and the full solution.

Topology and devices

The network as it opens in EVE-NG, drawn from the lab’s own canvas, and the image each node runs.

Topology of IPv6 interoperability with RA flags DHCPv6 and OSPFv35 nodes, 5 links. Every link is listed as text below the diagram.R1SRX1EOS1CHR1H1Ethernet2eth0ether3eth1ge-0/0/1Ethernet1Gi0/1ether2Gi0/0ge-0/0/0
5 nodes, with the interface names each link uses.
Every link, as text
  • R1 Gi0/0 to SRX1 ge-0/0/0
  • SRX1 ge-0/0/1 to EOS1 Ethernet1
  • R1 Gi0/1 to CHR1 ether2
  • EOS1 Ethernet2 to H1 eth0
  • CHR1 ether3 to H1 eth1
Nodes in IPv6 interoperability with RA flags DHCPv6 and OSPFv3, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
R1Cisco IOSvvios-adventerprisek9-m.spa.159-3.m91 vCPU, 512 MB
SRX1Juniper vSRX NextGen templatevsrxng-23.4R2-S3.92 vCPU, 4,096 MB
EOS1Arista vEOSveos-4.33.1.1F1 vCPU, 2,048 MB
CHR1MikroTik RouterOSmikrotik-7.14.21 vCPU, 256 MB
H1Alpine Linuxclbalpinebase-alpine-base-3-20-31 vCPU, 512 MB

How to open this lab

  1. Sign in to your workspace at lab.cloudlabbox.com.

  2. In File Manager, open Shared, then the folder Multi-vendor interoperability and troubleshooting guided labs.

  3. Open 09 - IPv6 interoperability with RA flags DHCPv6 and OSPFv3 and start its nodes, then open Lab Tasks for the scenario and the steps.

The lab is read-only. You can start the nodes and configure the devices, but changes to the topology can’t be saved. To change it, rebuild it in your own folder.

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CloudLabBox is independent of Arista Networks, Cisco, CompTIA, Fortinet, HPE, Juniper Networks and MikroTik. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.