Sim 12: Infrastructure Services: DHCP Relay, IP SLA Tracking and SNMPv3¶
Blueprint 4.2, 4.4, 4.5, 4.6
| Difficulty | Time target | Devices | Faults |
|---|---|---|---|
| Medium | 25 minutes | 1 x Catalyst 8000v, 3 x IOSv, 1 x Ubuntu | 3 |
Scenario¶
R1 is a branch router (Catalyst 8000v) with a primary WAN link to the head-office router R2 and a backup link through R3. It provides these services:
- DHCP relay: the branch LAN gets IPv4 addresses from the IOS DHCP server on R2 (relay with
ip helper-address) and stateful DHCPv6 addresses from the same server (DHCPv6 relay). - IP SLA and object tracking: an ICMP echo probe checks R2's WAN address every 5 seconds. The primary default route is tied to the probe with
track 1; a floating default route through R3 (AD 10) takes over when the probe fails. - SNMPv3: the NMS at 10.2.100.50 polls R1 using user
nmsuserwith SHA authentication and AES-128 privacy (authPriv). - Flexible NetFlow: traffic entering from the branch LAN is exported to the collector at 10.2.100.50, UDP 2055, NetFlow v9.
Download the lab
CML lab file · EVE-NG lab file
5 nodes. The lab boots already broken (the faults are in the start-up configs, so skip Break it). CML: Import a lab, then start it. EVE-NG: import the .unl from the lab list; if your image folder names differ, edit each node's image.
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