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Advanced MS Setup Guide

This section provides advanced deployment guidance for integration of Cisco Meraki switches into an existing network infrastructure. 

 

Making changes to your switched network, switches or switch ports can cause significant down time, please schedule accordingly

For Technical assistance, please reference our documentation or contact Cisco Meraki Support.

Default configuration

MS series switches have a default (out of box) configuration. This configuration is as follows:

  • All interfaces are configured as TRUNK with Native VLAN 1
  • All interfaces support 802.1Q trunk encapsulation
  • All interfaces will send management traffic on VLAN1 (untagged)
  • All interfaces have STP/RSTP enabled

In order for Meraki switches to update their configuration and/or firmware, each switch must have a valid IP address, default gateway, and must be able to send management traffic. Each switch must also be able to contact Meraki cloud services. For further information, please see Firewall Information.

If your network does not have a DHCP service running on the default management VLAN, a STATIC IP and/or different management VLAN must be manually configured. Please see Local Configuration

 

Management VLAN

By default, Meraki switches are configured to use VLAN 1 for untagged and management traffic and all switch interfaces are configured as trunk native VLAN 1. Modifying the VLAN used for management traffic can be done via the local configuration page per switch or globally via the Meraki dashboard:

Local configuration

Please see the local configuration section

Meraki Dashboard

Globally

Navigate to Configure > Switch settings and specify the desired VLAN in the "Management VLAN" section. 

Per Switch

Navigate to Monitor > Switches and select the desired switch. Now, choose "Set IP address" for the LAN IP field. From here, you can specify the switch's management VLAN.

Please allow a few moments for the configuration change to propagate. This requires that your MS switch(es) are online and reporting to the Meraki cloud.

 

Firmware upgrade process

When adding or installing a new Meraki device, as soon as it checks in to the Meraki cloud, it will verify that the firmware version it is running matches that of it's Meraki network container. If it does not, the device will automatically download and upgrade itself to match the network version. No user intervention is needed, and the firmware upgrade process usually completes within 10 minutes with only about 60 seconds of down time.

Meraki strives to make software upgrades as seamless and easy as possible. One of the benefits of the Meraki cloud architecture is that firmware can be delivered to one or even thousands of devices at once, automatically. 

It is important to note that Meraki device firmware is maintained at the network level. This means that each network container within dashboard has a specific firmware version, and all devices within that network container will be on that version of software.

 

Spanning Tree (STP, RSTP)

Spanning tree (IEEE 802.1D) and Rapid spanning tree (IEEE 802.1w) are both standards-based protocols. The MS series supports these protocols for maximum interoperability with other vendor switches. It is important to take note of the following deployment steps when installing an MS series switch in an existing switch infrastructure.

Enabling spanning tree

STP/RSTP are enabled by default on the MS series. In order to disable spanning tree, this can be done globally by navigating to Configure > Switch settings on the Meraki dashboard and selecting disable for the Spanning tree protocol field. One may also choose to disable sending BPDU's on particular interfaces. To do so, navigate to Configure > Switch ports, choose the desired port(s) and set STP to "disabled". 

Root bridge

When connecting access devices including the Meraki MS series switches, it is important to first ensure that a root bridge has been properly configured. In a larger switch fabric, this is typically done on the core switch.

Spanning tree will use several values to elect the root bridge. Once elected, this information is displayed per switch in the Meraki dashboard interface under Monitor > switches for reference. 

If further configuration on the MS switches is necessary, bridge priority can be modified. To do so, navigate to Configure > Switch settings on the Meraki dashboard. In the STP Configuration section, bridge priority per switch as well as a global enable/disable option are available.

Automatic edge port

MS switches will automatically place all ACCESS type interfaces into EDGE mode. This will cause for the interface to immediately transition the port into STP forwarding mode upon linkup. The port still participates in STP. So if the port is to be a part of the loop, the port eventually transitions into STP blocking mode.

Protocol interoperability

Several other protocols have been developed including pre-standard and non-standard protocols to either improve upon or facilitate the same functionality of spanning tree. It may be necessary to connect a Meraki MS series switch to an existing infrastructure running one of these protocols. 

MSTP (802.1s)

MSTP is an expansion of RSTP and adds a per-VLAN spanning tree instance to make use of better paths on each VLAN. MSTP is fully compatible with RSTP bridges, in that an MSTP BPDU can be interpreted by an RSTP bridge as an RSTP BPDU. Meraki switches do not support MSTP but are compatible and will see all MSTP instances as a single RSTP region.

PVST

This is a Cisco Catalyst protocol that is compatible with Spanning tree (802.1D). Connecting an MS series to an existing switch fabric running PVST will force the MS series switch(es) to run in legacy mode (STP) which can increase convergence time.

PVST+ (Rapid-PVST)

This is a Cisco Catalyst protocol that is compatible with Spanning tree (802.1D) and RSTP (802.1w). It is important to note however that because PVST+ is a multi-VLAN spanning tree protocol, in order for the MS series switches to participate in spanning tree a spanning tree instance must be running on the native VLAN of all switches running PVST+ so that BPDUs are seen by the Meraki switches in the topology.

Port configuration

Meraki switches support 802.1Q encapsulation and up to 4095 VLANs. This means that you have an option for how to configure each switch port and this is typically dependent on what is connecting to each interface. For configuration information, please reference our documentation.

Trunk (interconnect) port

Interfaces between switches or gateway devices are typically configured as TRUNK to support multiple VLANs. It may or may not be necessary to specify a Native VLAN.

Native VLAN

Depending on how your network is configured, it may necessary to specify a Native VLAN on a TRUNK interface. This specified VLAN will be used for all untagged traffic that enters and exits the interface. It is often more secure not to specify a native VLAN thus requiring all traffic to contain an 802.1Q tag.

Access port

Access ports are designed for edge/access devices such as workstations and printers. Any interface configured as an access port for a particular VLAN will remove the 802.1Q header on egress and only for the configured VLAN on the interface.

Voice VLAN

This is an optional setting for all access port interfaces that will force the interface to advertise the specified voice VLAN via discover protocols. It is designed to support multiple VLANs for deployments with VoIP phones that have a built-in switch. For more details, see Configuring a Voice VLAN

Protocol Interoperability

Several non-standard protocols have been developed to facilitate trunking or simplify VLAN change propagation. Meraki switches leverage the power of the cloud architecture to make port configuration easier than ever before and therefore do not support these non-standard protocols. However, interoperability may be required. 

VTP (VLAN Trunking Protocol)

This is a Cisco Catalyst protocol that supports automatic VLAN database propagation and per-interface VLAN pruning. Meraki switches do not support VTP but will forward VTP updates, which means they operate in VTP transparent mode.

Based on network topology, there are certain key things to note about VTP interoperability. For more information, please reference our documentation.

ISL Encapsulation

This is a Cisco Catalyst protocol that is not supported on Cisco Meraki switches

 

Power over Ethernet (PoE)

MS P-model switches support PoE (IEEE 802.3af) and PoE+ (IEEE 802.3at). When connecting PoE devices to an MS switch, the switch will snoop for LLDP and LLDP-MED power information. If the connected device supports LLDP, the switch will supply only the advertised power to the connected port, thus adding intelligence to per-port power budgeting. This information can be seen via Monitor > Switches by selecting the desired switch and port.

Over-budget behavior

If exceeding available PoE power, Meraki switches use a shedding algorithm based on interface number. The highest interface count to draw power and exceed PoE budget will no loger receive PoE power on that interface.

Pre-standard PoE

The following P-model switches can support Cisco pre-standard PoE (inline power): MS22, MS42, MS220, MS320, MS350

 

Switch stacking and redundancy

Enterprise deployments often require resiliency which is done through redundant physical connections and facilitated by software protocols.

Meraki switches support STP/RSTP which allow for several physical connections to coexist. In order to setup redundant connections, confirm that STP/RSTP is properly configured and enabled on your interconnect switch interfaces.

Additionally, LACP link aggregates can be easily configured to provide additional cable redundancy between switches. See Link Aggregation

 

For additional information on stacking Meraki switches, please view the Virtual Stacking whitepaper.

 

Selecting Accessories

Depending on your infrastructure needs and deployment requirements, selecting the proper accessories is key. For selecting the appropriate accessories for your SFP/SFP+ ports, it is recommended that you reference the SFP datasheet.

For interconnecting MS switches with SFP+ interfaces (MS42 / MS42P), Meraki recommends the use of Direct Attach (twinax) cables

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Last modified
13:18, 24 Apr 2017

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ID: 4476

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