HP HPE7-A08 - HPE Aruba Networking Certified Professional – Switching

When a VSX primary switch is powered off, it loses connectivity with management systems such as HPE Aruba Central. This causes the management system to trigger a "Switch Disconnected" alert because the switch is no longer reachable.

"Switch Reboot" alerts would indicate a restart, not power off.

"Switch Stack Conductor Change" refers to stack leadership changes, not VSX primary down.

"Switch STP Root Change" relates to Spanning Tree Protocol root bridge changes.

Hence, powering off the VSX primary causes a "Switch Disconnected" alert.

The output indicates the use of an aspath-list within a route-map, which is used to filter or match accepted AS paths in BGP. The aspath-list defines which AS paths are accepted, controlling route advertisement or acceptance.

The route-map is applied to neighbor configurations to filter routes based on AS paths.

Prefix-lists filter IP prefixes, not AS paths.

Neighbor remote-as export is not a valid command.

Therefore, the aspath-list is correctly used to define accepted AS paths.

The Local Priority (LP) applied to an incoming packet marked with DSCP 46 and CoS 7 depends on the configured QoS mapping.

DSCP 46 corresponds to Expedited Forwarding (EF), which is typically mapped to the highest priority.

CoS 7 also indicates high priority.

According to the QoS policy shown, the LP assigned is 1, indicating the highest priority level.

If the ISL between two VSX core switches is down and logs indicate that Core-2 has disabled its VSX LAG interfaces, it means Core-2 has disabled its VSX LAG interfaces, likely as a protective or failover mechanism.

Keepalive packets being dropped (Option B) may cause issues but logs specifically state interface disablement.

Both switches forwarding traffic (Option C) is unlikely if ISL is down.

Downstream switches inability to forward traffic (Option D) is a consequence, not the cause.

A screenshot of a computer AI-generated content may be incorrect.

For an interface connected to an untrusted device regarding DSCP markings, the recommended configurations are:

Apply a classifier-based policy to assign a Local Priority value (Option B). This overrides or marks traffic based on predefined criteria.

Configure qos trust none (Option E) to disable trusting DSCP or CoS markings from the device, preventing manipulation of QoS.

Trusting CoS (Option A) is incorrect because the device is untrusted.

DSCP maps and Weighted Fair Queuing (Options C and D) are additional QoS features but do not specifically address untrusted markings.

When User-Based Tunneling (UBT) is configured and HTTPS-enabled websites fail to load, this often relates to issues with packet fragmentation. The solution is to enable IP fragmentation on the devices to allow large tunneled packets to be properly fragmented and reassembled.

Path MTU discovery is helpful but may be blocked in some networks.

Fragment reassembly is usually on the receiving end.

Jumbo frames may not resolve fragmentation across tunneled paths.

Therefore, enabling IP fragmentation is the most effective solution.

Backing up the switch configuration to a remote Linux SFTP server requires using the copy command with the correct protocol (SFTP in this case), username, server IP, filename, and optionally the VRF to route management traffic.

Option A uses SCP and vrf default but the question mentions SFTP server, so SFTP protocol should be used.

Option B is a server-side command (not the switch).

Option C correctly uses copy startup-config sftp://user@192.168.1.100/switch_config.cfg vrf mgmt which backs up the startup-config via SFTP using the management VRF.

Option D is also a server-side command.

Using vrf mgmt is required because the management IP is in a separate VRF on CX switches.

The event message:

perl

Copy

2024-04-04T08:35:38.312254+00:00 ICX-Core-1 hpe-vaxd[2167]: Event[701|LOG_INFO|AMM1/1|VSX2 state local up, remote down]

indicates that the local VSX member is up, but the remote VSX member is down. In a VSX pair, both switches must be operational for full redundancy and synchronization.

This log means the secondary VSX switch (remote) is down or unreachable, causing loss of synchronization and possibly traffic failover issues.

Option B (keepalive detection) is related but the event specifically shows the state of the remote switch being down.

Options C and D refer to LAG or interface state, which are not what this log entry describes.

When deploying HPE Aruba VSX switches parallel to existing HPE Comware switches, choosing a first-hop redundancy protocol compatible with both platforms is essential. VRRP (Virtual Router Redundancy Protocol) is widely supported across multiple vendors and is suitable for multi-vendor environments.

HSRP is Cisco proprietary and not supported on Aruba Comware or CX.

Active Forwarding and Active Gateway are Aruba VSX internal mechanisms, not standard first-hop redundancy protocols.

VRRP provides seamless failover and is supported in Comware and Aruba CX platforms.

Thus, VRRP is the suitable choice.