As known in the art, a “stackable switch” is a network switch that can operate independently as a standalone device or in concert with one or more other stackable switches in a “stack” or “stacking system.”
One aspect of configuring and operating a stacking system such as system 150 of
In existing stacking systems, there are typically four options for assigning device IDs: (1) manually assigning a device ID to a given switch via the switch's console port; (2) manually entering the serial number for each non-master switch in the master switch so that the master switch can assign device IDs based on the serial numbers; (3) presenting an interactive UI to an administrator that displays the system's topology and asks the administrator to enter a device ID for each switch; and (4) executing an algorithm that “guesses” appropriate device IDs based on certain metrics. Unfortunately, each of these options suffers from certain drawbacks. For example, option (1) requires an administrator or technician to physically connect a terminal to the console port of each stackable switch in order to set the switch's device ID. In a large data center that has hundreds or thousands of stackable switches (of which only a portion may be connected to console terminals), this approach is too cumbersome to be practical.
Option (2) (i.e., manually entering serial numbers into the master switch) is highly error-prone. For instance, it is quite common to mis-transcribe characters in a long serial number string. Further, the task of collecting switch serial numbers can be challenging because such numbers are typically printed on the backside or underside of each switch. These locations are not easily accessible in many environments, such as data centers where switches are mounted into racks or other similar structures.
Option (3) addresses some of the issues of options (1) and (2) since it allows an administrator to enter device IDs via an interactive UI on the master switch, without having to physically access the non-master switches. However, some environments include many identical stacking systems that need to be configured similarly. In these scenarios, the administrator may prefer a mechanism for easily applying the same device ID configuration to all stacking systems, rather than running though the interactive UI for each individual stack.
Finally, option (4) (i.e., the “best guess” algorithm) is problematic because the algorithm involves computing all possible device ID permutations in a stacking system and ranking the permutations according to various metrics in order to arrive at a device ID assignment. For stacks with a moderate to large number of switches, this can result in a very large number of permutations, to the point where the algorithm cannot be feasibly run on existing hardware (there are ways to reduce the number of permutations based on switch order in linear or ring topologies, but these optimizations cannot be used for more complex topologies such as generalized meshes). Further, even if the algorithm is able to generate a device ID assignment for a given stacking system, the resulting device IDs may not be consistent with what the administrator has in mind, and thus may need to be reassigned using one of the other options mentioned above.
Techniques for assigning device identifiers in a system of devices are provided. In one embodiment, a master device of the system can maintain a first configuration that specifies a set of links between a first subset of the devices, where the first configuration includes a device identifier for each device in the first subset. The master device can further generate a second configuration that specifies a set of links between a second subset of the devices, where the second configuration is based on a physical topology of the system, and where one or more devices in the second subset are unknown devices that are not associated with a device identifier in the physical topology. The master device can then assign device identifiers to the unknown devices in the second subset by comparing the first configuration with the second configuration.
The following detailed description and accompanying drawings provide a better understanding of the nature and advantages of particular embodiments.
In the following description, for purposes of explanation, numerous examples and details are set forth in order to provide an understanding of various embodiments. It will be evident, however, to one skilled in the art that certain embodiments can be practiced without some of these details, or can be practiced with modifications or equivalents thereof.
The present disclosure describes techniques that can be performed by a master device in a system of devices for assigning unique identifiers (referred to as “device IDs”) to the various devices in the system. At a high level, the techniques can include one or more of the following features: (1) the receipt and/or maintenance of a provisional configuration that specifies provisional links that do not yet exist in the system's physical topology, as well as device IDs for the devices at the endpoints of the provisional links; (2) the generation of a physical configuration that specifies existing links in the system's physical topology; (3) the assignment of device IDs to “unknown” devices in the physical configuration (i.e., devices without assigned IDs) by comparing the provisional configuration with the physical configuration; and (4) the merging of the provisional configuration and the physical configuration into a merged configuration that is stored on the master device. Taken together, these features enable system administrators to easily assign devices IDs to the unknown devices in the system at, e.g., the time of system construction or device replacement, without incurring the drawbacks associated with conventional device ID assignment approaches.
For clarity of explanation, in the sections that follow, certain examples and embodiments are described in the context of assigning device IDs to stackable switches in a stacking system. However, it should be appreciated that the techniques described herein can apply to other types of systems where simplified device ID assignment is a desired or useful feature, such as Ethernet or SAN fabrics. Accordingly, within the detailed description, references to “stacks” or “stacking systems” can be construed as encompassing generalized systems of devices, and references to “switches” or “stackable switches” can be construed as encompassing generalized devices within a system.
Assume that an administrator of stacking system 200 wishes to add six additional switches to the system (i.e., switches 204, 206, 208, 210, 212, and 214). Switches 204-214 are not yet part of the physical topology of stacking system 200, but the administrator may wish to interconnect these switches in the form of a mesh-like topology as shown via dotted lines in
To accomplish this, device IDs must be assigned to new switches 204-214 so that their respective ports can be uniquely identified and configured. However, as noted in the Background section, existing techniques for performing device ID assignment in stacking systems suffer from various drawbacks.
To address these (and other similar) issues, master switch 202 can implement a novel device ID assignment process as illustrated in
For example, the listing below is a provisional configuration that specifies provisional links between switches 202-214. In this listing, each line corresponds to a provisional link in the format [endpoint device ID/local port—endpoint device ID/local port]. It should be appreciated that other data formats (such as grouping links by endpoint switch, or including an extra “module” identifier for switches that have multiple port modules) are also possible.
In one embodiment, each of the provisional links shown in Listing 1 can be entered into master switch 202 via a console command, such as “connect [endpoint device ID/local port—endpoint device ID/local port],” or some variant thereof. Alternatively, the information of Listing 1 can be captured in a file or some other data structure that is submitted to master switch 202.
Once provisional configuration 216 has been received and stored on master switch 202, the administrator can physically connect one or more of the switches he/she wishes to add to stacking system 200. For example,
Master switch 202 can then generate a second configuration (shown as physical configuration 218 in
For example, the listing below is a physical configuration that may be generated by master switch 202 in the context of
It should be noted that, although the format of listing 2 is identical to listing 1, in certain embodiments physical configuration 218 can be generated and/or stored in a format that is different than provisional configuration 216. Generally speaking, physical configuration 218 can be represented using any format that is sufficient to capture the existing links within the physical topology of stacking system 200, as well as the device IDs of known switches in the system.
Once physical configuration 218 has been generated, master switch 202 can execute an algorithm for comparing provisional configuration 216 with physical configuration 218 in order to assign device IDs to the unknown switches in the physical topology. In a particular embodiment, this can comprise traversing the existing links in physical configuration 218 and checking for corresponding provisional links in provisional configuration 216. If a provisional link is found that leads to an unknown switch in physical configuration 218, master switch can assign the device ID specified in the provisional link to the unknown switch. In this way, master switch 202 can map the user-defined device IDs in provisional configuration 216 to the switches that need device IDs in physical configuration 218. A generalized version of this algorithm is described with respect to
Finally, master switch 202 can transmit the device ID assignments determined via the algorithm above to the unknown switches (thereby allowing the switches to locally save their respective device IDs). Master switch 202 can also merge provisional configuration 216 and physical configuration 218 into a merged configuration 220 (as shown in
In listing 3 above, all of the unknown device IDs (represented by “?” in listing 2) have been filled in based on the device IDs in listing 1. In addition, provisional link [6/1-7/1] has been merged in from listing 1 (even though there is currently no such link in the physical topology), since the device ID(s) in this provisional link may be needed at a later point in time (for example, if switch 214 is added in the future).
With the device ID assignment process illustrated in
Further, since device IDs are assigned based on user-defined values, there is no need to execute a “best guess” algorithm in order to guess appropriate device IDs (unless the provisional configuration is incomplete). This is particularly important in stacking systems that support complex topologies such as meshes, because the best guess algorithm is generally too computationally expensive to be used on such topologies. This also means that there is no need for the administrator to modify device IDs that are determined via the “best guess” algorithm if, e.g., the administrator decides that the guessed IDs are not suitable.
While
Starting with
In response to this change in the physical topology, master switch 202 can generate a new physical configuration 306 (as shown in
Once physical configuration 306 has been generated, master switch 202 can execute an algorithm (identical to the algorithm described with respect to
Finally, master switch 202 can transmit the assigned device IDs to replacement switches 302 and 304 so that they can be locally set on each replacement switch (as shown in
With the approach shown in
In certain embodiments, as part of step 402, the master switch can actively prevent the administrator from entering provisional link information for existing links (i.e., links that already exist in the physical topology). This avoids errors in which existing link configurations are erroneously overwritten. For instance, the master switch can check whether the end ports for each provisional link are in “down states” before accepting the provisional configuration. If the end port for a particular provisional link is in an “up state,” that means the port is physically connected, and thus the provisional configuration is rejected. If the provisional link is a trunk comprising multiple ports, any trunk port in an up state can result in a rejection.
At block 404, the master switch can generate a physical configuration based on the system's physical topology (after one or more new switches have been connected). The physical configuration can specify existing links in the topology. In a particular embodiment, the master switch can derive the physical configuration by running a standard topology discovery algorithm.
Generally speaking, the physical configuration generated at block 404 will include device ID information for switches in the system that have already been assigned IDs (such as the master switch). However, the physical configuration will not include device ID information for unknown switches that have not yet been assigned IDs (such as newly added switches).
At block 406, the master switch can execute an algorithm for comparing the provisional configuration with the physical configuration. At a high level, this algorithm can map provisional links in the provisional configuration to existing links in the physical configuration, and thereby leverage the device ID information in the provisional configuration to assign device IDs to unknown switches in the physical configuration/topology. A detailed discussion of this algorithm is provided with respect to
Once the master switch has determined devices IDs for the unknown switches per block 406, the master switch can transmit the assignments to the respective switches so that the device IDs can be locally saved (block 408). In addition, the master switch can merge the provisional configuration with the physical configuration in order to generate a merged configuration (block 410). The merged configuration can include all of the existing links in the system's physical topology (with correctly assigned device IDs), as well as provisional links that have not yet been added to the physical topology. This merged configuration can then be saved in a local non-volatile memory (e.g., NVRAM) of the master device.
Although not shown in
At block 502, the master switch can generate a physical configuration based on the system's physical topology (with the replacement switches in place). The master switch can then compare its existing configuration (e.g., the merged configuration generated at block 410 of
At block 506, the master switch can transmit the assigned device IDs to the replacement switches so that the IDs can be saved locally. Finally, at block 508, the master switch can generate a new merged configuration in a manner similar to block 410 of
In flowchart 600, topology A refers to the physical topology of the system (i.e., the topology corresponding to the system's physical configuration). Topology A includes at least one device with an assigned device ID (e.g., the master device). Topology A also includes one or more devices with no assigned device IDs (i.e., unknown devices). Generally speaking, topology A will not be partitioned, since topology A will typically be generated via a topology discovery algorithm that relies on a connected path between any two devices.
Topology B refers to the provisional topology of the system (i.e., the topology corresponding to the system's provisional configuration). Each link in topology B is a provisional link that identifies device IDs for its two endpoint devices. Topology B may not be complete, since an administrator may decide not to configure all provisional links. In these cases, topology B may be partitioned into multiple sections (in other words, some devices may not have a path for reaching all other devices). Further, topology B may be a superset, a subset, or contain only partial elements of topology A.
The goal of the algorithm of
Starting with block 602, the master device of the system can first copy all devices with assigned device IDs in topology A to a set C. The master device can then check whether set C is empty (block 604). If so, the master device can determine that the algorithm is complete and flowchart 600 can end.
If set C is not empty, the master device can select a device X in set C and can check whether all of the links of device X have been processed by the algorithm (blocks 606 and 608). If all of the links have been processed, the master device can remove device X from set C (block 610) and return to block 604. Otherwise, the master device can select an unprocessed link L of device X that connects to a neighbor device (block 612).
At block 614, the master device can check whether the neighbor device connected via link L is an unknown device (i.e., does not have an assigned device ID). If it is not an unknown device, the master device can conclude that it does not need a device ID. Accordingly, the master device can return to block 608 in order to process additional links of device X.
If the neighbor device is an unknown device, the master device can check whether link L is also in topology B (block 616). If it is not, the master device can determine that there is not enough information to assign a device ID to the neighbor device, and can return to block 608.
On the other hand, if link L is in topology B, the master device can assign a device ID to the neighbor device based on topology B's provisional link information (block 618). For example, if the provisional link in topology B indicates that the device ID for device X is 2 and the device ID for the neighbor device is 5, the master device can assign device ID 5 to the neighbor device in topology A.
At block 620, the master device can add the neighbor device (via its assigned device ID) to set C. Finally, flowchart 600 can return to block 604 so that the master device can process additional devices in set C. As noted previously, once set C becomes empty, flowchart 600 can end.
The following is a list of steps that can be carried out by the algorithm in order to arrive at result topology 706:
In result topology 706, three devices are not assigned device IDs because topology B does not include provisional links connected to those devices. As noted with respect to
As shown, network switch 800 includes a management module 802, a switch fabric module 804, and a number of I/O modules 806(1)-806(N). Management module 802 represents the control plane of network switch 800 and thus includes one or more management CPUs 808 for managing/controlling the operation of the device. Each management CPU 808 can be a general purpose processor, such as a PowerPC, Intel, AMD, or ARM-based processor, that operates under the control of software stored in an associated memory (not shown).
Switch fabric module 804 and I/O modules 806(1)-806(N) collectively represent the data, or forwarding, plane of network switch 800. Switch fabric module 804 is configured to interconnect the various other modules of network switch 800. Each I/O module 806(1)-806(N) can include one or more input/output ports 810(1)-810(N) that are used by network switch 800 to send and receive data packets. As noted with respect to
It should be appreciated that network switch 800 is illustrative and not intended to limit embodiments of the present invention. Many other configurations having more or fewer components than switch 800 are possible.
The above description illustrates various embodiments of the present invention along with examples of how aspects of the present invention may be implemented. The above examples and embodiments should not be deemed to be the only embodiments, and are presented to illustrate the flexibility and advantages of the present invention as defined by the following claims. For example, although certain embodiments have been described with respect to particular process flows and steps, it should be apparent to those skilled in the art that the scope of the present invention is not strictly limited to the described flows and steps. Steps described as sequential may be executed in parallel, order of steps may be varied, and steps may be modified, combined, added, or omitted. As another example, although certain embodiments have been described using a particular combination of hardware and software, it should be recognized that other combinations of hardware and software are possible, and that specific operations described as being implemented in software can also be implemented in hardware and vice versa.
The specification and drawings are, accordingly, to be regarded in an illustrative rather than restrictive sense. Other arrangements, embodiments, implementations and equivalents will be evident to those skilled in the art and may be employed without departing from the spirit and scope of the invention as set forth in the following claims.
The present application claims the benefit and priority under 35 U.S.C. 119(e) of U.S. Provisional Application No. 61/745,396, filed Dec. 21, 2012, entitled “STACKING CONFIGURATION AND MANAGEMENT,” and U.S. Provisional Application No. 61/799,093, filed Mar. 15, 2013, entitled “METHOD FOR CONFIGURING INTERCONNECTION AND MATCHING CONFIGURATION TO A SET OF DEVICES.” The entire contents of these applications are incorporated herein by reference for all purposes.
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Number | Date | Country | |
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20140181275 A1 | Jun 2014 | US |
Number | Date | Country | |
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61745396 | Dec 2012 | US | |
61799093 | Mar 2013 | US |