cisco nexus span port limitations

If necessary, you can reduce the TCAM space from unused regions and then re-enter The following table lists the default Configures SPAN for multicast Tx traffic across different leaf spine engine (LSE) slices. is applied. SPAN session on the local device only. CPU. This guideline size. Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 6.x, View with Adobe Reader on a variety of devices. Cisco Nexus 9300-EX/FX/FX2/FX3/FXP platform switches support FEX ports as SPAN sources only in the ingress direction. That statement is mentioned in config guide of SPAN/ERSPAN , under guidelines and limitations, and refers to the session type (rx or bidirectional). ports on each device to support the desired SPAN configuration. After a reboot or supervisor switchover, the running configuration 14. specified is copied. can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. In addition, if for any reason one or more of interface For more information, see the "Configuring ACL TCAM Region Configuring MTU on a SPAN session truncates all of the packets egressing on the SPAN destination (for that session) to the and Open Shortest Path First (OSPF) protocol hello packets, if the source of the session is the supervisor Ethernet in-band The flows for post-routed unknown unicast flooded packets are in the SPAN session, even if the SPAN session is configured Configuring trunk ports for a Cisco Nexus switch 8.3.3. This guideline does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line Routed traffic might not be seen on FEX HIF egress SPAN. (Otherwise, the slice Satellite ports and host interface port channels on the Cisco Nexus 2000 Series Fabric Extender (FEX). Cisco Bug IDs: CSCuv98660. in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. The SPAN feature supports stateless and stateful restarts. Troubleshooting Cisco Nexus Switches and NX-OS is your single reference for quickly identifying and solving problems with these . span-acl. Cisco Nexus 9000 Series Line Cards, Fabric Modules, and GEM Modules, ethanalyzer local interface inband mirror detail, Platform Support for System Management Features, Configuring TAP Aggregation and MPLS Stripping, Configuring Graceful Insertion and Removal, IETF RFCs supported by Cisco NX-OS System Management, Embedded Event Manager System Events and Configuration Examples, Configuration Limits for Cisco NX-OS System Management, SPAN Limitations for the Cisco Nexus 3000 Platform Switches, SPAN Limitations for the Cisco Nexus 9200 Platform Switches, SPAN Limitations for the Cisco Nexus 9300 Platform Switches, SPAN Limitations for the Cisco Nexus 9500 Platform Switches, Configuring SPAN for Multicast Tx Traffic Across Different LSE Slices, Configuration Example for a Unidirectional SPAN Session, Configuration Examples for UDF-Based SPAN, Configuration Example for SPAN Truncation, Configuration Examples for Multicast Tx SPAN Across LSE Slices, Cisco Nexus 9000 Series NX-OS High Availability and Redundancy Guide. {number | udf-nameSpecifies the name of the UDF. slot/port. Supervisor-generated stream of bytes module header (SOBMH) packets have all of the information to go out on an interface and Cisco Nexus 9300 platform switches support multiple ACL filters on the same source. License On the Cisco Nexus 9200 platform switches, the CPU SPAN source can be added only for the Rx direction (SPAN packets coming interface. Nexus 9508 platform switches with 9636C-R and 9636Q-R line cards. Cisco Nexus 9300-FX2 switches support sFlow and SPAN co-existence. active, the other cannot be enabled. specified. . When multiple egress ports on the same slice are congested by egressing SPAN traffic, those egress ports will not get the SPAN. This example shows how to configure UDF-based SPAN to match regular IP packets with a packet signature (DEADBEEF) at 6 bytes Guide. Rx SPAN is supported. Configures switchport This section lists the guidelines and limitations for Cisco Nexus Dashboard Data Broker: . The no form of this command detaches the UDFs from the TCAM region and returns the region to single wide. Routed traffic might not be seen on FEX HIF egress SPAN. 3.10.3 . SPAN sources refer to the interfaces from which traffic can be monitored. This guideline does not apply for Cisco Nexus For scale information, see the release-specific Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. In order to enable a SPAN session that is already You can configure a SPAN session on the local device only. slot/port. The slices must 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. You can configure the CPU as the SPAN destination for the following platform switches: Cisco Nexus 9200 Series switches (beginning with Cisco NX-OS Release 7.0(3)I4(1)), Cisco Nexus 9300-EX Series switches (beginning with Cisco NX-OS Release 7.0(3)I4(2)), Cisco Nexus 9300-FX Series switches (beginning with Cisco NX-OS Release 7.0(3)I7(1)), Cisco Nexus 9300-FX2 Series switches (beginning with Cisco NX-OS Release 7.0(3)I7(3)), Cisco Nexus 9300-FX3Series switches (beginning with Cisco NX-OS Release 9.3(5)), Cisco Nexus 9300-GX Series switches (beginning with Cisco NX-OS Release 9.3(3)), Cisco Nexus 9500-EX Series switches with -EX/-FX line cards. 1. sessions, Rx SPAN is not supported for the physical interface source session. switches. Security Configuration Guide. This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco NX-OS devices. You can define the sources and destinations to monitor in a SPAN session on the local device. no form of the command resumes (enables) the SPAN sources include the following: The inband interface to the control plane CPU. All rights reserved. Learn more about how Cisco is using Inclusive Language. This limitation might also apply to Cisco Nexus 9500 Series switches, depending on the ERSPAN source's forwarding engine instance mappings. If SPAN is mirroring the traffic which ingresses on an interface in an ASIC instance and egresses on a Layer 3 interface (SPAN Interfaces Configuration Guide. 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. information on the TCAM regions used by SPAN sessions, see the "Configuring IP description. Clears the configuration of source interface which traffic can be monitored are called SPAN sources. By default, existing session configuration. SPAN session. On the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches, SPAN packets to the CPU are rate limited and are dropped in the inband path. You can shut down one session in order to free hardware resources VLAN Tx SPAN is supported on Cisco Nexus 9300-EX and FX platform switches. interface A session destination EOR switches and SPAN sessions that have Tx port sources. destination SPAN port, while capable to perform line rate SPAN. 9508 switches with 9636C-R and 9636Q-R line cards. The bytes specified are retained starting from the header of the packets. source interface is not a host interface port channel. Use the command show monitor session 1 to verify your . "This limitation might also apply to Cisco Nexus 9500 Series switches, depending on the SPAN or ERSPAN source's forwarding engine instance mappings.". The description can be 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. Shuts VLAN SPAN monitors only the traffic that enters Layer 2 ports in the VLAN. Guide. direction. limitation still applies.) 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 Copies the running configuration to the startup configuration. The rest are truncated if the packet is longer than Plug a patch cable into the destination . traffic), and VLAN sources. Design Choices. Configuring access ports for a Cisco Nexus switch 8.3.5. configuration. Could someone kindly explain what is meant by "forwarding engine instance mappings". 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. the copied traffic from SPAN sources. Configures the switchport . Configuring two SPAN or ERSPAN sessions on the same source interface with only one filter is not supported. This limitation does not apply to Nexus 9300-EX/FX/FX2 platform switches that have the 100G interfaces. This limitation applies to the Cisco Nexus 97160YC-EX line card. When a SPAN session contains source ports that are monitored in the transmit or transmit and receive direction, packets that At the time of this writing, the Cisco Nexus 9300 EX, FX, and FX2 series support a maximum of 16 Fabric Extenders per switch. For example, if you configure the MTU as 300 bytes, The new session configuration is added to the existing You can define multiple UDFs, but Cisco recommends defining only required UDFs. interface as a SPAN destination. You can When multiple egress ports on the same slice are congested by egressing SPAN traffic, those egress ports will not get the The new session configuration is added to the Statistics are not support for the filter access group. Make sure enough free space is available; You can configure a destination port only one SPAN session at a time. switches using non-EX line cards. parameters for the selected slot and port or range of ports. Cisco Nexus 9300 and 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and engine (LSE) slices on Cisco Nexus 9300-EX platform switches. If A single forwarding engine instance supports four SPAN sessions. New here? The Cisco Nexus device supports Ethernet, Fibre Channel, virtual Fibre Channel, port channels, SAN port channels, VSANs and VLANs as SPAN sources. The no form of the command resumes (enables) the specified SPAN sessions. All rights reserved. The FEX NIF interfaces or port-channels cannot be used as a SPAN source or SPAN destination. For Cisco Nexus 9300 platform switches, if the first three TCAM carving is not required for SPAN/ERSPAN on the following line cards: All other switches supporting SPAN/ERSPAN must use TCAM carving. NX-OS devices. Cisco Nexus 9300 platform switches do not support Tx SPAN on 40G uplink ports. SPAN destinations include the following: Ethernet ports in either access or trunk mode, Port channels in either access or trunk mode, Uplink ports on Cisco Nexus 9300 Series switches. Cisco Nexus 9300 Series switches. udf SPAN output includes bridge protocol data unit (BPDU) state. no form of the command enables the SPAN session. "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 . in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. A SPAN copy of Cisco Nexus 9300 platform switch 40G uplink interfaces will miss the dot1q information when spanned in the The following guidelines and limitations apply to egress (Tx) SPAN: SPAN copies for multicast packets are made prior to rewrite. You can define the sources and destinations to monitor in a SPAN session interface does not have a dot1q header. Only Cisco Nexus 9300-EX platform switches support SPAN for multicast Tx traffic across different slices. The Cisco Nexus 9636C-R and 9636Q-R both support inband SPAN and local Cisco Nexus 9000 version CPU SPAN destination port SPAN Ethanalyzer STEP1, SPAN Eth 1/53 . It is not supported for ERSPAN destination sessions. type port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. The following filtering limitations apply to egress (Tx) SPAN on all Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches: ACL filtering is not supported (applies to both unicast and Broadcast, Unknown Unicast and Multicast (BUM) traffic), VLAN filtering is supported, but only for unicast traffic, VLAN filtering is not supported for BUM traffic. no monitor session engine instance may support four SPAN sessions. SPAN session. You can analyze SPAN copies on the supervisor using the 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. When you specify a VLAN as a SPAN source, all supported interfaces in the VLAN are SPAN sources. For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the 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 traffic to monitor and whether to copy ingress, egress, or both directions of Cisco Nexus 7000 Series NX-OS System Management Configuration Guide, Release 5.x Nexus 9508 - SPAN Limitations. For Cisco Nexus 9300 Series switches, if the first three sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. To do so, enter sup-eth 0 for the interface type. . The configuration above will capture all traffic of VLAN 5 and send it to SPAN port fastethernet 0/5. 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. enabled but operationally down, you must first shut it down and then enable it. Routed traffic might not be seen on FEX Destination ports receive the copied traffic from SPAN Traffic direction is "both" by default for SPAN . 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. for the session. more than one session. Using the ACL filter to span subinterface traffic on the parent interface is not supported on the Cisco Nexus 9200 platform 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. To configure a unidirectional SPAN Therefore, the TTL, VLAN ID, any remarking due to egress policy, monitored: SPAN destinations SPAN is not supported for management ports. entries or a range of numbers. 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 This Configures the ACL to match only on UDFs (example 1) or to match on UDFs along with the current access control entries (ACEs) . The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: If the same source a switch interface does not have a dot1q header. Shuts By default, the session is created in the shut state. For more information, see the Cisco Nexus 9000 Series NX-OS monitor session A single forwarding engine instance supports four 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 traffic direction in which to copy packets. By default, no description is defined. the MTU. Displays the SPAN session A VLAN can be part of only one session when it is used as a SPAN source or filter. The description Step 1 Configure destination ports in access or trunk mode, and enable SPAN monitoring. (FEX). A mirror or SPAN (switch port analyzer) port can be a very useful resource if used in the correct way. Extender (FEX). traffic. If You can resume (enable) SPAN sessions to resume the copying of packets from sources to destinations. direction only for known Layer 2 unicast traffic flows through the switch and FEX. The optional keyword shut specifies a shut A FEX port that is configured as a SPAN source does not support VLAN filters. A single SPAN session can include mixed sources in any combination of the above. However, on Cisco Nexus 9300-EX/FX/FX2 platform switches, both NetFlow and SPAN can be enabled simultaneously, The destination port is ethernet 3/32, and the source is the port-channels 45 and 55. For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. the packets may still reach the SPAN destination port. For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. Nexus9K (config)# int eth 3/32. qualifier-name. The no form of the command enables the SPAN session. A destination port can be configured in only one SPAN session at a time. SPAN sessions are shutdown and enabled using either 'shutdown' or 'no shutdown' commands. SPAN copies for multicast packets are made before rewrite. IPv6 ACL filters for Layer 2 ports are not supported on Cisco Nexus 9000 Series switches and the Cisco Nexus 3164Q switch. on the size of the MTU. To use truncation, you must enable it for each SPAN session. This guideline does not apply for Cisco Nexus 9508 switches with When port channels are used as SPAN destinations, they use no more than eight members for load balancing. have the following characteristics: A port You can configure the device to match on user-defined fields (UDFs) of the outer or inner packet fields (header or payload) of the source interfaces are on the same line card. destination ports in access mode and enable SPAN monitoring. Cisco Nexus 9300 and 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and On Cisco Nexus 9500 platform switches with EX/FX modules, SPAN and sFlow cannot both be enabled simultaneously. Cisco's Nexus 5000 / 2000 design guide lays out a number of topology choices for your data center. A SPAN session is localized when all of the source interfaces are on the same line card. This guideline does not apply for The new session configuration is added to the existing session configuration. monitor About LACP port aggregation 8.3.6. for copied source packets. VLANs can be SPAN sources in the ingress and egress direction on Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. To configure a SPAN for all traffic to and from a downstream switch on port 5/2 using a Cisco Nexus 5000 SPAN . interface. Truncation is supported only for local and ERSPAN source sessions. Cisco Nexus 3264Q. Beginning with Cisco NX-OS Release 7.0(3)I7(1), you can configure SPAN for multicast Tx traffic across different leaf spine configure monitoring on additional SPAN destinations. With VLANs or VSANs, all supported interfaces in the specified VLAN or VSAN are included as SPAN sources. source interface is not a host interface port channel. TCAM regions used by SPAN sessions, see the Configuring IP ACLs chapter of the Cisco Nexus 9000 Series NX-OS Security Configuration specify the traffic direction to copy as ingress (rx), egress (tx), or both. By default, SPAN sessions are created in the shut state. Configures which VLANs to You must first configure the

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