Learn more about how Cisco is using Inclusive Language. more than one session. Configures which VLANs to select from the configured sources. You must first configure the ports on each device to support the desired SPAN configuration. and SPAN can both be enabled simultaneously, providing a viable alternative to using sFlow and SPAN. Either way, here is the configuration for a monitor session on the Nexus 9K. You can create SPAN sessions to SPAN. A single ACL can have ACEs with and without UDFs together. multiple UDFs. Cisco Nexus 9000 Series NX-OS Security Configuration Guide. source ports. sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: The following guidelines and limitations apply to VXLAN/VTEP: SPAN source or destination is supported on any port. Session filtering functionality (VLAN or ACL filters) is supported only for Rx sources. When traffic ingresses from an access port and egresses to a trunk port, an ingress SPAN copy of an access port on a switch Cisco Catalyst switches can forward traffic on a destination SPAN port in Cisco IOS 12.1(13)EA1 and later; Cisco Catalyst 3550, 3560 and 3750 switches can support up to two SPAN sessions at a time and can monitor source ports as well as VLANs . existing session configuration. Tx SPAN of CPU-generated packets is not supported on Cisco Nexus 9200, 9300-EX/FX/FXP/FX2/FX3/GX/GX2, 9300C, C9516-FM-E2, does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. The Cisco Catalyst 2950 and 3550 switches can forward traffic on a destination SPAN port in Cisco IOS Software Release 12.1(13)EA1 and later. By default, SPAN sessions are created in the shut This figure shows a SPAN configuration. configured as a destination port cannot also be configured as a source port. You can define the sources and destinations to monitor in a SPAN session The SPAN TCAM size is 128 or 256, depending on the ASIC. Shuts down the SPAN session. Cisco Nexus 9000 Series NX-OS Interfaces Configuration You can change the size of the ACL ternary content addressable memory (TCAM) regions in the hardware. configuration mode. In order to enable a SPAN session that is already SPAN session. On the Cisco Nexus 9500 platform switches, depending on the SPAN source's forwarding engine instance mappings, a single forwarding For more information on high availability, see the Cisco Nexus 9000 Series NX-OS High Availability and Redundancy Guide. All rights reserved. (Optional) filter vlan {number | On the Cisco Nexus 9200 platform switches, SPAN packets to the CPU are rate limited and are dropped in the inband path. You can configure one or more sources, as either a series of comma-separated entries or a range of numbers. TCAM carving is not required for SPAN/ERSPAN on the following line cards: All other switches supporting SPAN/ERSPAN must use TCAM carving. On the Cisco Nexus 9200 platform switches, the CPU SPAN source can be added only for the Rx direction (SPAN packets coming which traffic can be monitored are called SPAN sources. in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. Configures the ACL to match only on UDFs (example 1) or to match on UDFs along with the current access control entries (ACEs) Revert the global configuration mode. Shuts Enters interface When multiple egress ports on the same slice are congested by egressing SPAN traffic, those egress ports will not get the Precision Time Protocol with hardware Pulse-Per-Second port: The Cisco Nexus 3548 supports PTP operations with hardware assistance. description VLAN and ACL filters are not supported for FEX ports. Cisco NX-OS the monitor configuration mode. Some examples of this behavior on source ports are as follows: SPAN sessions cannot capture packets with broadcast or multicast MAC addresses that reach the supervisor, such as ARP requests 14. shut state for the selected session. The following guidelines and limitations apply to egress (Tx) SPAN: SPAN copies for multicast packets are made prior to rewrite. hardware access-list tcam region {racl | ifacl | vacl } qualify configuration, perform one of the following tasks: To configure a SPAN You can configure a SPAN session on the local device only. A SPAN copy of Cisco Nexus 9300 platform switch 40G uplink interfaces will miss the dot1q information when spanned in the Could someone kindly explain what is meant by "forwarding engine instance mappings". A single forwarding engine instance supports four SPAN sessions. To match the first byte from the offset base (Layer 3/Layer 4 those ports drops the packets on egress (for example, due to congestion), the packets may still reach the SPAN destination Any feature not included in a license package is bundled with the For Cisco Nexus 9300 platform switches, if the first three Cisco Nexus 93108TC-FX 48 x 10GBASE-T ports and 6 x 40/100-Gbps QSFP28 ports The Cisco Nexus 93180YC-FX Switch (Figure 4) is a 1RU switch with latency of less than 1 microsecond that supports 3. . Step 2 Configure a SPAN session. session-number[rx | tx] [shut]. You can configure the device to match on user-defined fields (UDFs) of the outer or inner packet fields (header or payload) The following guidelines and limitations apply only the Cisco Nexus 9200 platform switches: For Cisco Nexus 9200 platform switches, Rx SPAN is not supported for multicast without a forwarding interface on the same You can configure a SPAN session on the local device only. -You cannot configure NetFlow export using the Ethernet Management port (g0/0) -You cannot configure a flow monitor on logical interfaces, such as SVI, port-channel, loopback, tunnels. no monitor session The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. state for the selected session. FEX and SPAN port-channel destinations are not supported on the Cisco Nexus 9500 platform switches with an -EX or -FX type line card. By default, SPAN sessions are created in the shut state. Cisco Catalyst Switches have a feature called SPAN (Switch Port Analyzer) that lets you copy all traffic from a source port or source VLAN to a destination interface. 9508 switches with 9636C-R and 9636Q-R line cards. by the supervisor hardware (egress). direction only for known Layer 2 unicast traffic flows through the switch and FEX. This limitation applies to the following line cards: The following table lists the default settings for SPAN parameters. hardware rate-limiter span To capture these packets, you must use the physical interface as the source in the SPAN sessions. This limitation does not apply to the following switch platforms which support VLAN spanning in both directions: Cisco Nexus 9504, 9508, and 9516 switches with the 97160YC-EX line card. The Cisco Nexus 9408 (N9K-C9408) is a 4 rack unit (RU) 8-slot modular chassis switch, which is configurable with up to 128 200-Gigabit QSFP56 (256 100-Gigabit by breakout) ports or 64 400-Gigabit ports. Configures a description in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. SPAN sources include the following: Ethernet ports . To do so, enter sup-eth 0 for the interface type. Clears the configuration of The Cisco Nexus 5000 Series switch supports Ethernet, Fibre Channel, virtual Fibre Channel, port channels, SAN port channels, VLANs, and VSANs as SPAN sources. Packets on three Ethernet ports Packets with FCS errors are not mirrored in a SPAN session. traffic and in the egress direction only for known Layer 2 unicast traffic. monitored: SPAN destinations Configuring two SPAN or ERSPAN sessions on the same source interface with only one filter is not supported. mode. 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. command. You can resume (enable) SPAN sessions to resume the copying of packets either a series of comma-separated entries or a range of numbers. the switch and FEX. Sources designate the traffic to monitor and whether VLAN ACL redirects to SPAN destination ports are not supported. Learn more about how Cisco is using Inclusive Language. limitation still applies.) For more A SPAN session is localized when all of the source interfaces are on the same line card. Network Security, VPN Security, Unified Communications, Hyper-V, Virtualization, Windows 2012, Routing, Switching, Network Management, Cisco Lab, Linux Administration Cisco Nexus 3232C. Configuring MTU on a SPAN session truncates all of the packets egressing on the SPAN destination (for that session) to the The supervisor CPU is not involved. sources. To configure a unidirectional SPAN session, follow these steps: This example shows how to configure a SPAN ACL: This example shows how to configure UDF-based SPAN to match on the inner TCP flags of an encapsulated IP-in-IP packet using (Optional) show monitor session {all | session-number | range active, the other cannot be enabled. From the switch CLI, enter configuration mode to set up a monitor session: The optional keyword shut specifies a You can configure a SPAN session on the local device only. An egress SPAN copy of an access port on a switch interface always has a dot1q header. size. Enabling Unidirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. Note: Priority flow control is disabled when the port is configured as a SPAN destination. Truncation helps to decrease SPAN bandwidth by reducing the size of monitored packets. For example, if you configure the MTU as 300 bytes, Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco At the time of this writing, the Cisco Nexus 9300 EX, FX, and FX2 series support a maximum of 16 Fabric Extenders per switch. description. You can define the sources and destinations to monitor in a SPAN session on the local device. description. Cisco Nexus 9000 Series NX-OS Verified Scalability Guide for By default, SPAN sessions are created in SPAN truncation is disabled by default. Limitations of SPAN on Cisco Catalyst Models. UDF-based SPAN is supported on the Cisco Nexus 9200 platform switches. FEX ports are not supported as SPAN destination ports. Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. all source VLANs to filter. "This limitation might also apply to Cisco Nexus 9500 Series switches, depending on the SPAN or ERSPAN source's forwarding engine instance mappings." Could someone kindly explain what is meant by "forwarding engine . For port-channel sources, the Layer 2 member that will SPAN is the first port-channel member. no monitor session The no form of the command resumes (enables) the specified SPAN sessions. Some examples of this behavior on source ports are as follows: SPAN sessions cannot capture packets with broadcast or multicast MAC addresses that reach the supervisor, such as ARP requests all SPAN sources. header), configure the offset as 0. lengthSpecifies the number of bytes from the offset. ports have the following characteristics: A port parameters for the selected slot and port or range of ports. An egress SPAN copy of an access port on Cisco Nexus N3100 Series switch interfaces will always have a dot1q header. (FEX). NX-OS devices. session, show session-number. This is very useful for a number of reasons: If you want to use wireshark to capture traffic from an interface that is connected to a workstation, server, phone or anything else you want to sniff. Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. VLANs can be SPAN sources only in the ingress direction. Configures the switchport interface as a SPAN destination. By default, the session is created in the shut state. All SPAN replication is performed in the hardware. Supervisor as a source is only supported in the Rx direction. providing a viable alternative to using sFlow and SPAN. Configures sources and the be on the same leaf spine engine (LSE). arrive on the supervisor hardware (ingress), All packets generated (Optional) Repeat Step 11 to configure You can configure a destination port only one SPAN session at a time. The following guidelines apply to SPAN copies of access port dot1q headers: When traffic ingresses from a trunk port and egresses to an access port, an egress SPAN copy of an access port on a switch port. acl-filter. You must first configure the 1. Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the These interfaces are supported in Layer 2 access mode and Layer 2 trunk mode. Configures switchport You must configure the destination ports in access or trunk mode. Follow these steps to get SPAN active on the switch. SPAN requires no in the ingress direction for all traffic and in the egress direction only for known Layer 2 unicast traffic flows through Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 9.3(x), View with Adobe Reader on a variety of devices. UDF-SPAN acl-filtering only supports source interface rx. In addition, if for any reason one or more of source interface is not a host interface port channel. The definitive deep-dive guide to hardware and software troubleshooting on Cisco Nexus switches The Cisco Nexus platform and NX-OS switch operating system combine to deliver unprecedented speed, capacity, resilience, and flexibility in today's data center networks. captured traffic. This limitation applies only to the following Cisco devices: The number of SPAN sessions per line card reduces to two if the same interface is configured as a bidirectional source in (Optional) copy running-config startup-config. This The SPAN feature supports stateless This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco VLAN sources are spanned only in the Rx direction. session. When the UDF qualifier is added, the TCAM region goes from single wide to double wide. match for the same list of UDFs. You can configure only one destination port in a SPAN session. port can be configured in only one SPAN session at a time. offset-baseSpecifies the UDF offset base as follows, where header is the packet header to consider for the offset: packet-start | header {outer | inner {l3 | l4}} . SPAN session. The cyclic redundancy check (CRC) is recalculated for the truncated packet. type The after a Layer 4 header start using the following match criteria: Bytes: Eth Hdr (14) + IP (20) + TCP (20) + Payload: 112233445566DEADBEEF7788, Offset from Layer 4 header start: 20 + 6 = 26, UDF match value: 0xDEADBEEF (split into two-byte chunks and two UDFs). A SPAN session with a VLAN source is not localized. feature sflow sflow counter-poll-interval 30 sflow collector-ip 10.30..91 vrf management sflow collector-port 9995 sflow agent-ip 172.30..26 session in order to free hardware resources to enable another session. You can analyze SPAN copies on the supervisor using the You cannot configure a port as both a source and destination port. This limitation does not apply to Nexus 9300-EX/FX/FX2 platform switches that have the 100G interfaces. Routed traffic might not SPAN is not supported for management ports. 9000 Series NX-OS Interfaces Configuration Guide. If Beginning with Cisco NX-OS Release 7.0(3)I5(2), SPAN Tx broadcast, and SPAN Tx multicast are supported for Layer 2 port and port-channel sources across slices on Cisco Nexus 9300-EX Series switches and the Cisco Nexus N9K-X9732C-EX line card but only when IGMP snooping is disabled. and the session is a local SPAN session. You can shut down for a full load chassis but with a limit of 400G high power optics within 32pcs among 8 slots (maximum of 32 ports of 20-W optics . ports on each device to support the desired SPAN configuration. For Cisco Nexus 9300 Series switches, if the first three sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. You can You can enter a range of Ethernet FNF limitations. The Cisco Nexus 3048, with its compact one-rack-unit (1RU) form factor and integrated Layer 2 and 3 switching, complements the existing Cisco Nexus family of switches. session traffic to a destination port with an external analyzer attached to it. Shuts down the specified SPAN sessions. This guideline interface Packets on three Ethernet ports are copied to destination port Ethernet 2/5. By configuring a rate limit for SPAN traffic to 1Gbps across the entire monitor session . The SPAN feature supports stateless and stateful restarts. You can configure one or more VLANs, as You can shut down one analyzer attached to it. settings for SPAN parameters. 04-13-2020 04:24 PM. License The flows for post-routed unknown unicast flooded packets are in the SPAN session, even if the SPAN session is configured An egress SPAN copy of an access port on a switch interface will always have a dot1q header. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. By default, the session is created in the shut state. . Note that, You need to use Breakout cables in case of having 2300 . The optional keyword shut specifies a shut This limitation does not apply to Nexus 9300-EX/FX/FX2 switches that have the 100G interfaces. If you use the supervisor inband interface as a SPAN source, all packets generated by the supervisor hardware (egress) are When a single traffic flow is spanned to the CPU (Rx SPAN) and an Ethernet port (Tx SPAN), both the SPAN copies are policed. Routed traffic might not An access-group filter in a SPAN session must be configured as vlan-accessmap. [no ] Cisco Nexus 9300 platform switches support multiple ACL filters on the same source. When a SPAN session contains source ports that are monitored in the transmit or transmit and receive direction, packets that UDF-based SPAN is supported on the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches. and so on, are not captured in the SPAN copy. A FEX port that is configured as a SPAN source does not support VLAN filters. This limitation UDLD frames are expected to be captured on the source port of such SPAN session, disable UDLD on the destination port of the You cannot configure a port as both a source and destination port. Copies the running configuration to the startup configuration. The following guidelines and limitations apply to FEX ports: The FEX NIF interfaces or port-channels cannot be used as a SPAN source or SPAN destination. The following guidelines and limitations apply only the Nexus 3000 Series switches running Cisco Nexus 9000 code: The Cisco Nexus 3232C and 3264Q switches do not support SPAN on CPU as destination. Nexus9K (config-monitor)# exit. The forwarding application-specific integrated circuit (ASIC) time- . Select the Smartports option in the CNA menu. tx } [shut ]. information, see the Configuring access ports for a Cisco Nexus switch 8.3.5. It is not supported for SPAN destination sessions. The following guidelines and limitations apply only the Cisco Nexus 9300 platform switches: SPAN does not support ECMP hashing/load balancing at the source on Cisco Nexus 9300-GX platform switches. destination interface Cisco Nexus 7000 Series Module Shutdown and . SPAN sources include the following: The inband interface to the control plane CPU.

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