Explanation:
* Aggregate links across multiple switches -->
vsx
role primary
inter-switch-link lag 256
keepalive peer 192.168.0.1 source 192.168.0.0 vrf KA
(Snippet 4)
* Establish redundant links between the aggregation and core layers --> router ospf 1 maximum-paths 2 (Snippet 2)
* Extend layer 2 across multiple sites -->
interface vxlan 1
no shutdown
source ip 10.1.0.4
(Snippet 1)
* Identify individual layer 2 segments in an overlay -->
vni 11
vtep-peer 10.1.0.5
vlan 11
(Snippet 3)
Comprehensive Detailed Explanation along with All References available from related to the HPE Campus Access Switching Expert certification objectives at end of each question below:
* Aggregate links across multiple switches:This requirement describes Multi-Chassis Link Aggregation (MC-LAG), where a device forms a LAG to two separate upstream switches that act as a logical pair. In AOS-CX, VSX (Virtual Switching Extension) enables this functionality. Snippet 4 shows commands related to setting up VSX (vsx, role primary, inter-switch-link, keepalive), which is the foundation for MC-LAG.
References:AOS-CX VSX Guide.Relates to "Network Resiliency and virtualization" (8%), "Switching" (19%).
Establish redundant links between the aggregation and core layers:This often involves Layer 3 routing protocols utilizing multiple paths. Snippet 2 (router ospf 1, maximum-paths 2) configures OSPF to use up to two Equal Cost Multi-Paths (ECMP). If redundant links between aggregation and core result in equal OSPF costs, this command enables load sharing and redundancy at Layer 3.
References:AOS-CX IP Routing Guide (OSPF, ECMP). Relates to "Routing" (16%), "Network Resiliency and virtualization" (8%).
Extend layer 2 across multiple sites:VXLAN (Virtual Extensible LAN) is the standard overlay technology for extending Layer 2 segments over an underlying Layer 3 network, enabling L2 adjacency across different physical locations (sites, racks, pods). Snippet 1 shows the basic configuration of a VXLAN tunnel interface (interface vxlan 1, source ip), which is the core component for VXLAN tunneling.
References:AOS-CX VXLAN Guide.Relates to "Switching" (19%), "Connectivity" (9%).
Identify individual layer 2 segments in an overlay:Within a VXLAN overlay, each separate Layer 2 broadcast domain (typically corresponding to a VLAN) is identified by a unique VXLAN Network Identifier (VNI). This VNI tags the encapsulated traffic. Snippet 3 shows the configuration associating VNI 11 with the local VLAN 11 (vni 11, vlan 11). The vtep-peer command is relevant when using EVPN as the control plane.
This configuration directly maps an L2 segment (VLAN 11) to its identifier (VNI 11) within the overlay.
References:AOS-CX EVPN Guide, AOS-CX VXLAN Guide.Relates to "Switching" (19%), "Connectivity" (9%).
