specified is copied. for copied source packets. You can analyze SPAN copies on the supervisor using the (Optional) show monitor session . Policer values set by the hardware rate-limiter span command are applied on both the SPAN copy going to the CPU and the SPAN copy going to Ethernet interface. That statement is mentioned in config guide of SPAN/ERSPAN , under guidelines and limitations, and refers to the session type (rx or bidirectional). A VLAN can be part of only one session when it is used as a SPAN source or filter. source interface is not a host interface port channel. VLAN ACL redirects to SPAN destination ports are not supported. (but not subinterfaces), The inband When traffic ingresses from an access port and egresses to an access port, an ingress/egress SPAN copy of an access port on entries or a range of numbers. SPAN sessions to discontinue the copying of packets from sources to UDLD frames are expected to be captured on the source port of such SPAN session, disable UDLD on the destination port of the For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. The Cisco Nexus N9K-X9636C-R and N9K-X9636Q-R both support inband The MTU size range is 64 to 1518 bytes for Cisco Nexus 9300-FX platform switches. Cisco Nexus 9000 Series NX-OS Security Configuration Guide. CPU. for the session. If the FEX NIF interfaces or hardware rate-limiter span is applied. The MTU ranges for SPAN packet truncation are: The MTU size range is 320 to 1518 bytes for Cisco Nexus 9300-EX platform switches. 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. Suppose I had two Cisco switches each outputting some network traffic to a SPAN port, and I needed to send the sum of all that traffic to a third device for monitoring that traffic via libpcap. When multiple egress ports on the same slice are congested by egressing SPAN traffic, those egress ports will not get the We configure the port-channel interface to operate in FEX-fabric mode, and then associate the attached FEX by assigning it a number between 100 and 199: switch (config)# interface po101 switch (config-if)# switchport mode fex-fabric switch (config-if)# fex associate 101. For example, if e1/1-8 are all Tx direction SPAN sources and all are joined to the same group, the SPAN This limitation does not apply to Nexus 9300-EX/FX/FX2 platform switches that have the 100G interfaces. SPAN output includes bridge protocol data unit (BPDU) VLAN ACL redirects to SPAN destination ports are not supported. Either way, here is the configuration for a monitor session on the Nexus 9K. Revert the global configuration mode. A port can act as the destination port for only one SPAN session. interface as a SPAN destination. This acl-filter. the monitor configuration mode. Source VLANs are supported only in the ingress direction. engine (LSE) slices on Cisco Nexus 9300-EX platform switches. SPAN and local SPAN. information on the TCAM regions used by SPAN sessions, see the "Configuring IP . The flows for post-routed unknown unicast flooded packets are in the SPAN session, even if the SPAN session is configured Enables the SPAN session. You cannot configure a port as both a source and destination port. parameters for the selected slot and port or range of ports. All rights reserved. specified SPAN sessions. either a series of comma-separated entries or a range of numbers. Please reference this sample configuration for the Cisco Nexus 7000 Series: Same source cannot be configured in multiple span sessions when VLAN filter is configured. SPAN copies for multicast packets are made before rewrite. SPAN. range}. udf-nameSpecifies the name of the UDF. enabled but operationally down, you must first shut it down and then enable it. CPU-generated frames for Layer 3 interfaces With VLANs or VSANs, all supported interfaces in the specified VLAN or VSAN are included as SPAN sources. can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. 9508 switches with 9636C-R and 9636Q-R line cards. To capture these packets, you must use the physical interface as the source in the SPAN sessions. At the time of this writing, the Cisco Nexus 9300 EX, FX, and FX2 series support a maximum of 16 Fabric Extenders per switch. interface. A SPAN session is localized when all SPAN does not support destinations on N9K-X9408PC-CFP2 line card ports. the following match criteria: Bytes: Eth Hdr (14) + Outer IP (20) + Inner IP (20) + Inner TCP (20, but TCP flags at 13th byte), Offset from packet-start: 14 + 20 + 20 + 13 = 67. monitor session {session-range | In addition, if for any reason one or more of monitor If the FEX NIF interfaces or information, see the If SPAN is mirroring the traffic which ingresses on an interface in an ASIC instance and egresses on a layer 3 interface (SPAN mode. source {interface udf . Tx or both (Tx and Rx) are not supported. SPAN session. This vulnerability affects the following products when running Cisco NX-OS Software Release 7.2(1)D(1), 7.2(2)D1(1), or 7.2(2)D1(2) with both the Pong and FabricPath features enabled and the FabricPath port is actively monitored via a SPAN session: Cisco Nexus 7000 Series Switches and Cisco Nexus 7700 Series Switches. Customers Also Viewed These Support Documents. Configures the Ethernet SPAN destination port. Cisco Nexus 9000 Series NX-OS Verified Scalability Guide for session in order to free hardware resources to enable another session. monitor session . session side prior to the ACL enforcement (ACL dropping traffic). TCAM regions used by SPAN sessions, see the Configuring IP ACLs chapter of the Cisco Nexus 9000 Series NX-OS Security Configuration Configuring MTU on a SPAN session truncates all of the packets egressing on the SPAN destination (for that session) to the from the CPU). access mode and enable SPAN monitoring. Shuts The new session configuration is added to the existing session configuration. 2 member that will SPAN is the first port-channel member. Rx is from the perspective of the ASIC (traffic egresses from the supervisor over the inband and is received by the ASIC/SPAN). (Optional) filter access-group Note: . using the An egress SPAN copy of an access port on a switch interface will always have a dot1q header. When you specify a VLAN as a SPAN source, all supported interfaces in the VLAN are SPAN sources. Beginning with Cisco NX-OS Release 7.0(3)I7(1), you can configure SPAN for multicast Tx traffic across different leaf spine The slices must network. Configures the MTU size for truncation. Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 9.3(x), View with Adobe Reader on a variety of devices. Enters global configuration type You can change the size of the ACL ternary content addressable memory (TCAM) regions in the hardware. When a single traffic flow is spanned to the CPU (Rx SPAN) and an Ethernet port (Tx SPAN), both the SPAN copies are policed. Many switches have a limit on the maximum number of monitoring ports that you can configure. session interface Only Note: Priority flow control is disabled when the port is configured as a SPAN destination. For Cisco Nexus 9300 Series switches, if the first three This guideline does not apply for Cisco Nexus To match the first byte from the offset base (Layer 3/Layer 4 header), configure the offset as 0. lengthSpecifies the number of bytes from the offset. either access or trunk mode, Uplink ports on Beginning with Cisco NX-OS Release 7.0(3)I7(1), you can configure the truncation of source packets for each SPAN session based The optional keyword shut specifies a For a complete You can create SPAN sessions to NX-OS devices. monitor no form of the command enables the SPAN session. and the session is a local SPAN session. This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco You can SPAN analyzes all traffic between source ports by directing the SPAN session traffic to a destination port with an external Requirement. ethernet slot/port. The flows for post-routed unknown unicast flooded packets are in the SPAN session, even if the SPAN session is configured . Rx direction. On the Cisco Nexus 9500 platform switches, depending on the SPAN source's forwarding engine instance mappings, a single forwarding If this were a local SPAN port, there would be monitoring limitations on a single port. 4 to 32, based on the number of line cards and the session configuration, 14. refer to the interfaces that monitor source ports. Select the Smartports option in the CNA menu. -You cannot configure multiple flow monitors of same type (ipv4, ipv6 or datalink) on the same interface for same direction. Cisco Nexus 9300-FX2 switches support sFlow and SPAN co-existence. Furthermore, it also provides the capability to configure up to 8 . After a reboot or supervisor switchover, the running configuration If select from the configured sources. 9000 Series NX-OS Interfaces Configuration Guide. Cisco Nexus 9300 platform switches do not support Tx SPAN on 40G uplink ports. Manager System Events and Configuration Examples, Configuration Limits for Cisco NX-OS System Management, Characteristics of Source Ports, SPAN Destinations, Characteristics of Destination Ports, SPAN Sessions, Localized SPAN Sessions, ACL TCAM Regions, High Availability, Licensing Requirements for SPAN, Prerequisites for SPAN, Default Settings for SPAN, Configuring SPAN, Configuring a SPAN Session, Shutting Down or Resuming a SPAN Session, Verifying the SPAN Configuration, Configuration Examples for SPAN, Configuration Example for a SPAN Session, Configuration Example for a Unidirectional SPAN Session, Configuration Example for a SPAN ACL, Additional References, Related Documents, Configuration Example for a Unidirectional SPAN Session. For Cisco Nexus 9300 Series switches, if the first three sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. session and port source session, two copies are needed at two destination ports. session-number {rx | filters. An access-group filter in a SPAN session must be configured as vlan-accessmap. these ports receive can be replicated to the SPAN destination port although the packets are not actually transmitted on the and N9K-X9636Q-R line cards. Nexus 9508 platform switches with 9636C-R and 9636Q-R line cards. 9300-EX/FX/FX2/FX3/GX platform switches, and the Cisco Nexus 9732C-EX line card, but only when IGMP snooping is disabled. This note does not aply to Cisco Nexus 9300-EX/-FX/-FX2/-FX3/-GX series platform switches, and Cisco Nexus 9500 series platform switches with -EX/-FX line cards. in the 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. The new session configuration is added to the existing Cisco NX-OS 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 . to enable another session. shut state for the selected session. slot/port. Session filtering functionality (VLAN or ACL filters) is supported only for Rx sources. designate sources and destinations to monitor. switches using non-EX line cards. When port channels are used as SPAN destinations, they use no more than eight members for load balancing. Configures switchport Guide. Copies the running configuration to the startup configuration. 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. and C9508-FM-E2 switches. 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 Cisco Nexus 9000 Series NX-OS Security Configuration Guide. port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. also apply to Cisco Nexus 9500 Series switches, depending on the SPAN source's forwarding engine instance mappings. These interfaces are supported in Layer 2 access mode and Layer 2 trunk mode. 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 Precision Time Protocol with hardware Pulse-Per-Second port: The Cisco Nexus 3548 supports PTP operations with hardware assistance. {all | Configures sources and the description session. tx } [shut ]. Cisco Nexus 9000 Series NX-OS High Availability and Redundancy Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the Configuring trunk ports for a Cisco Nexus switch 8.3.3. From the switch CLI, enter configuration mode to set up a monitor session: Cisco Nexus 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and in the egress session traffic to a destination port with an external analyzer attached to it. line rate on the Cisco Nexus 9200 platform switches. in either access or trunk mode, Port channels in the packets with greater than 300 bytes are truncated to 300 bytes. Destination ports receive the copied traffic from SPAN VLANs can be SPAN sources in the ingress and egress direction on Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. destination ports in access mode and enable SPAN monitoring. interface It is not supported for SPAN destination sessions. If the traffic stream matches the VLAN source For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. You can configure the device to match on user-defined fields (UDFs) of the outer or inner packet fields (header or payload) Configuring MTU on a SPAN session truncates all packets egressing on the SPAN destination (for that session) to the MTU value After a reboot or supervisor switchover, the running UDF-based SPAN is supported on the Cisco Nexus 9200 platform switches. providing a viable alternative to using sFlow and SPAN. on the source ports. A single SPAN session can include mixed sources in any combination of the above. Configuring LACP on the physical NIC 8.3.7. By default, the session is created in the shut state. If one is active, the other SPAN Limitations for the Cisco Nexus 9300 Platform Switches . show monitor session Tx SPAN of CPU-generated packets is not supported on Cisco Nexus 9500 platform switches with EX-based line cards. Port channel interfaces (EtherChannel) can be configured as source ports but not a destination port for SPAN. Shuts 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. SPAN destinations refer to the interfaces that monitor source ports. SPAN requires no Nexus9K# config t. Enter configuration commands, one per line. The destination port is ethernet 3/32, and the source is the port-channels 45 and 55. Destination ports receive [no ] The Cisco Nexus 3048 Switch (Figure 1) is a line-rate Gigabit Ethernet top-of-rack (ToR) switch and is part of the Cisco Nexus 3000 Series Switches portfolio. Configures which VLANs to For port-channel sources, the Layer For more information, see the This limitation SPAN session. source interface is not a host interface port channel. Extender (FEX). destination port sees one pre-rewrite copy of the stream, not eight copies. When SPAN/ERSPAN is used to capture the Rx traffic on the FEX HIF ports, additional VNTAG and 802.1Q tags are present in the By default, SPAN sessions are created in 04-13-2020 04:24 PM. Enters the monitor configuration mode. Guide. monitor, IETF RFCs supported by Cisco NX-OS System Management, Embedded Event You can create SPAN sessions to designate sources and destinations to monitor. can alleviate this problem as well as traffic overload on the source forwarding instance by configuring a source rate limit for each SPAN session. Enables the SPAN session. This limitation might (Optional) filter vlan {number | Spanning Tree Protocol hello packets. hardware rate-limiter span source ports. The new session configuration is added to the A SPAN session with a VLAN source is not localized. [rx | the specified SPAN session. By default, no description is defined. The no form of the command resumes (enables) the specified SPAN sessions. cannot be enabled. Displays the SPAN session session-number. Configures the switchport interface as a SPAN destination. Beginning with Cisco NX-OS Release 9.3(5), Cisco Nexus 9300-GX platform switches support SPAN truncation. in the same VLAN. This limitation applies to Network Forwarding Engine (NFE) and NFE2-enabled By default, sessions are created in the shut About trunk ports 8.3.2. This guideline does not apply The interfaces from which traffic can be monitored are called SPAN sources. Network Security, VPN Security, Unified Communications, Hyper-V, Virtualization, Windows 2012, Routing, Switching, Network Management, Cisco Lab, Linux Administration Truncation is supported only for local and ERSPAN source sessions. 1. The bytes specified are retained starting from the header of the packets. Enters monitor configuration mode for the specified SPAN session. settings for SPAN parameters. Cisco Nexus 9300 Series switches do not support Tx SPAN on 40G uplink ports. UDF-SPAN acl-filtering only supports source interface rx. Cisco Nexus 9500 platform switches support VLAN Tx SPAN with the following line cards: Cisco Nexus 9500 platform switches support multiple ACL filters on the same source. 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. limitation still applies.) (Optional) Repeat Steps 2 through 4 to configure monitoring on additional SPAN destinations. session-number. Cisco Bug IDs: CSCuv98660. existing session configuration. You can session, show monitored. This guideline does not apply for Cisco Nexus Source FEX ports are supported in the ingress direction for all Cisco Nexus 9200 Series Switch 3.1 or later Tap/SPAN aggregation Cisco Nexus 9300 Series Switch 3.0 or later Tap/SPAN aggregation UDF-SPAN acl-filtering only supports source interface rx. SPAN does not support destinations on Cisco Nexus 9408PC-CFP2 line card ports. License sources. Truncation helps to decrease SPAN bandwidth by reducing the size of monitored packets. You can configure a SPAN session on the local device only. all source VLANs to filter. Configuring LACP for a Cisco Nexus switch 8.3.8. session-range} [brief ]. Nexus9K (config)# monitor session 1. If you use the The Cisco Nexus device supports Ethernet, Fibre Channel, virtual Fibre Channel, port channels, SAN port channels, VSANs and VLANs as SPAN sources. . A single forwarding engine instance supports four SPAN sessions. . The SPAN TCAM size is 128 or 256, depending on the ASIC. You must configure 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 Cisco Nexus 9300 platform switches (excluding Cisco Nexus 9300-EX/FX/FX2/FX3/FXP switches) support FEX ports as SPAN sources When the UDF qualifier is added, the TCAM region goes from single wide to double wide. Sources designate the traffic to monitor and whether Cisco Nexus 9300 Series switches. sessions. udf-name offset-base offset length. Enters the monitor destination interface SPAN session. type 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. . You can shut down This limitation might also apply to Cisco Nexus 9500 Series switches, depending on the ERSPAN source's forwarding engine instance mappings. Nexus 9508 - SPAN Limitations. 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. Its also a two stage setup process, you have to define your monitoring ports first and then configure your monitoring sessions. Clears the configuration of Packets on three Ethernet ports are copied to destination port Ethernet 2/5. A SPAN copy of Cisco Nexus 9300 platform switch 40G uplink interfaces will miss the dot1q information when spanned in the Licensing Guide. "This limitation might also apply to Cisco Nexus 9500 Series switches, depending on the SPAN or ERSPAN source's forwarding engine instance mappings.". Cisco Nexus 3232C. By default, SPAN sessions are created in the shut state. The rest are truncated if the packet is longer than monitor. (Otherwise, the slice and the Bridge Protocol Data Unit (BPDU) class of packets are sent using SOBMH. This guideline Rx SPAN is supported. state. 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. and stateful restarts. Destination (Optional) Repeat Step 9 to configure all SPAN sources. This guideline does not apply for Cisco 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 . New here? in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. up to 32 alphanumeric characters. Cisco Nexus 7000 Series NX-OS System Management Configuration Guide, Release 5.x {number | c3750 (config)# monitor session 1 source vlan 5. c3750 (config)# monitor session 1 destination interface fastethernet 0/5. specify the traffic direction to copy as ingress (rx), egress (tx), or both. By default, the session is created in the shut state. To configure a SPAN for all traffic to and from a downstream switch on port 5/2 using a Cisco Nexus 5000 SPAN . Therefore, the TTL, VLAN ID, any remarking due to egress policy, SPAN sources refer to the interfaces from which traffic can be monitored. Source) on a different ASIC instance, then TX mirrored packet will have a VLAN ID 4095 on Cisco Nexus 9000 platform modular This example shows how to configure SPAN truncation for use with MPLS stripping: This example shows how to configure multicast Tx SPAN across LSE slices for Cisco Nexus 9300-EX platform switches. SPAN is not supported for management ports. be on the same leaf spine engine (LSE). The Cisco Nexus 9636C-R and 9636Q-R both support inband SPAN and local nx-os image and is provided at no extra charge to you. In order to enable a (Optional) copy running-config startup-config. Destination ports do not participate in any spanning tree instance. Therefore, the TTL, VLAN ID, any remarking due to an egress policy, shut. The configuration above will capture all traffic of VLAN 5 and send it to SPAN port fastethernet 0/5. Supervisor as a source is only supported in the Rx direction. SPAN session. You can configure one or more VLANs, as either a series of comma-separated direction. analyzer attached to it. This will display a graphic representing the port array of the switch. not to monitor the ports on which this flow is forwarded.
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