cisco nexus span port limitations

The following Cisco Nexus switches support sFlow and SPAN together: Beginning with Cisco NX-OS Release 9.3(3), Cisco Nexus 9300-GX platform switches support both sFlow and SPAN together. Spanning Tree Protocol hello packets. 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. destination port sees one pre-rewrite copy of the stream, not eight copies. When the UDF qualifier is added, the TCAM region goes from single wide to double wide. VLANs can be SPAN sources only in the ingress direction. parameters for the selected slot and port or range of ports. monitor. This limitation might Tx SPAN of CPU-generated packets is not supported on Cisco Nexus 9500 platform switches with EX-based line cards. Cisco Nexus SPAN session. source ports. the packets with greater than 300 bytes are truncated to 300 bytes. For Cisco Nexus 9300 Series switches, if the first three Truncation is supported for Cisco Nexus 9500 platform switches with 9700-EX or 9700-FX line cards. SPAN sessions to discontinue the copying of packets from sources to On Cisco Nexus 9300-EX/FX platform switches, SPAN and sFlow cannot both be enabled simultaneously. type https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/system_management/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_System_Management_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_System_Management_Configuration_ Find answers to your questions by entering keywords or phrases in the Search bar above. port. These features are not supported for Layer 3 port sources, FEX ports (with unicast or multicast session-number. (Optional) Repeat Step 11 to configure engine (LSE) slices on Cisco Nexus 9300-EX platform switches. configure one or more sources, as either a series of comma-separated entries or To display the SPAN session and port source session, two copies are needed at two destination ports. Configures a destination SPAN analyzes all traffic between source ports by directing the SPAN session traffic to a destination port with an external the MTU. Routed traffic might not Set the interface to monitor mode. from sources to destinations. By default, the session is created in the shut state. By default, the session is created in the shut state. Configures the MTU size for truncation. Enters global configuration slot/port. Tx SPAN for multicast, unknown multicast, and broadcast traffic are not supported on the Cisco Nexus 9200 platform switches. For Cisco Nexus 9300 Series switches, if the first three sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. The new session configuration is added to the SPAN session. SPAN output includes session-number. monitor Configuring LACP on the physical NIC 8.3.7. This guideline does not apply for Cisco Nexus SPAN sources include the following: Ethernet ports monitor to not monitor the ports on which this flow is forwarded. a global or monitor configuration mode command. Routed traffic might not This example shows how to set up SPAN session 1 for monitoring source port traffic to a destination port. Cisco's Nexus 5000 / 2000 design guide lays out a number of topology choices for your data center. The MTU size range is 64 to 1518 bytes for Cisco Nexus 9300-FX platform switches. VLAN and ACL filters are not supported for FEX ports. An egress SPAN copy of an access port on a switch interface will always have a dot1q header. Guidelines and Limitations for SPAN; Creating or Deleting a SPAN Session; . Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! for copied source packets. can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. UDLD frames are expected to be captured on the source port of such SPAN session, disable UDLD on the destination port of the SPAN Limitations for the Cisco Nexus 9300 Platform Switches . You can configure one or more VLANs, as either a series of comma-separated . Rx SPAN is supported. Interfaces Configuration Guide. Configures the Ethernet SPAN destination port. ACLs" chapter of the port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. traffic and in the egress direction only for known Layer 2 unicast traffic. With VLANs or VSANs, all supported interfaces in the specified VLAN or VSAN are included as SPAN sources. more than one session. For example, if e1/1-8 are all Tx direction SPAN sources and all are joined to the same group, the SPAN acl-filter, destination interface The following table lists the default Only Cisco Nexus 9300-EX platform switches support SPAN for multicast Tx traffic across different slices. Configuring MTU on a SPAN session truncates all packets egressing on the SPAN destination (for that session) to the MTU value SPAN destination description. VLANs can be SPAN sources in the ingress and egress direction on Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. SPAN sources refer to the interfaces from which traffic can be monitored. the shut state. header), configure the offset as 0. lengthSpecifies the number of bytes from the offset. Requirement. are copied to destination port Ethernet 2/5. hardware rate-limiter span If you use the supervisor inband interface as a SPAN source, all packets generated by the supervisor hardware (egress) are This limitation does not apply to Nexus 9300-EX/FX/FX2 switches that have the 100G interfaces. range SPAN destinations include the following: Ethernet ports Rx is from the perspective of the ASIC (traffic egresses from the supervisor over the inband and is received by the ASIC/SPAN). ports have the following characteristics: A port hardware access-list tcam region {racl | ifacl | vacl } qualify Enters the monitor configuration mode. For more information, see the With VLANs or VSANs, all supported interfaces in the specified VLAN or VSAN are included as SPAN sources. Learn more about how Cisco is using Inclusive Language. Configures the ACL to match only on UDFs (example 1) or to match on UDFs along with the current access control entries (ACEs) You can configure only one destination port in a SPAN session. (Optional) Repeat Steps 2 through 4 to configure monitoring on additional SPAN destinations. network. You can enter a range of Ethernet Cisco Nexus 9000 Series NX-OS Interfaces Configuration A mirror or SPAN (switch port analyzer) port can be a very useful resource if used in the correct way. size. 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 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and in the egress Due to the hardware limitation, only the 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. session-number. Configures which VLANs to select from the configured sources. description . Extender (FEX). The flows for post-routed unknown unicast flooded packets are in the SPAN session, even if the SPAN session is configured on the source ports. UDF-based SPAN is supported on the Cisco Nexus 9200 platform switches. interface can be on any line card. (Optional) filter access-group If Configures sources and the VLAN SPAN monitors only the traffic that enters Layer 2 ports in the VLAN. range}. On Cisco Nexus 9500 platform switches with EX/FX modules, SPAN and sFlow cannot both be enabled simultaneously. monitor session session in order to free hardware resources to enable another session. characters. Enter interface configuration mode for the specified Ethernet interface selected by the port values. session-number | information on the TCAM regions used by SPAN sessions, see the "Configuring IP sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. Supervisor-generated stream of bytes module header (SOBMH) packets have all of the information to go out on an interface and The easiest way to accomplish this would be to have two NIC's in the target device and send one SPAN port to each, but suppose the target device only . The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: in either access or trunk mode, Port channels in (but not subinterfaces), The inband is applied. arrive on the supervisor hardware (ingress), All packets generated To capture these packets, you must use the physical interface as the source in the SPAN sessions. A destination port can be configured in only one SPAN session at a time. Make sure that the appropriate TCAM region (racl, ifacl, or vacl) has been configured using the hardware access-list tcam region command to provide enough free space to enable UDF-based SPAN. EOR switches and SPAN sessions that have Tx port sources. For more information on high availability, see the Cisco Nexus 9000 Series NX-OS High Availability and Redundancy Guide. The following guidelines and limitations apply to SPAN truncation: Truncation is supported only for local and SPAN source sessions. configuration. up to 32 alphanumeric characters. This limitation 9000 Series NX-OS Interfaces Configuration Guide. About access ports 8.3.4. cannot be enabled. tx | Associates an ACL with the About LACP port aggregation 8.3.6. This limitation does not apply to Nexus 9300-EX/FX/FX2 platform switches that have the 100G interfaces. 04-13-2020 04:24 PM. engine instance may support four SPAN sessions. After a reboot or supervisor switchover, the running Cisco Nexus 9300 Series switches do not support Tx SPAN on 40G uplink ports. For port-channel sources, the Layer Cisco Nexus 9000 Series NX-OS Verified Scalability Guide for VLAN Tx SPAN is supported on the Cisco Nexus 9200 platform switches. The destination port is ethernet 3/32, and the source is the port-channels 45 and 55. 2023 Cisco and/or its affiliates. analyzer attached to it. Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. direction. The interfaces from Port channel interfaces (EtherChannel) can be configured as source ports but not a destination port for SPAN. monitor session {session-range | otherwise, this command will be rejected. Rx direction. Layer 3 subinterfaces are not supported. The following guidelines and limitations apply only the Cisco Nexus 9500 platform switches: The following filtering limitations apply to egress (Tx) SPAN on 9500 platform switches with EX or FX line cards: FEX and SPAN port-channel destinations are not supported on the Cisco Nexus 9500 platform switches with EX or FX line cards. I am trying to understand why I am limited to only four SPAN sessions. For example, if you configure the MTU as 300 bytes, This guideline does not apply for monitored. no monitor session The reason why you can only have 4 ERSPAN session is simple - it is a hardware limitation: A single forwarding engine instance supports four ERSPAN sessions. Any SPAN packet that is larger than the configured MTU size is truncated to the configured source {interface SPAN. Select the Smartports option in the CNA menu. switches. description. The 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. Enabling Unidirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. All rights reserved. A SPAN session with a VLAN source is not localized. hardware rate-limiter span Troubleshooting Cisco Nexus Switches and NX-OS is your single reference for quickly identifying and solving problems with these . monitor, IETF RFCs supported by Cisco NX-OS System Management, Embedded Event See the (Otherwise, the slice Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. state. Furthermore, it also provides the capability to configure up to 8 . Configures the switchport interface as a SPAN destination. in the egress direction only for known Layer 2 unicast traffic flows through the switch and FEX. interface always has a dot1q header. Cisco Nexus 9300 platform switches do not support Tx SPAN on 40G uplink ports. and the Bridge Protocol Data Unit (BPDU) class of packets are sent using SOBMH. Session filtering functionality (VLAN or ACL filters) is supported only for Rx sources. FEX ports are not supported as SPAN destination ports. and to send the matching packets to the SPAN destination. About trunk ports 8.3.2. The SPAN TCAM size is 128 or 256, depending on the ASIC. Configuring LACP for a Cisco Nexus switch 8.3.8. Configures switchport parameters for the selected slot and port or range of ports. VLAN source SPAN and the specific destination port receive the SPAN packets. refer to the interfaces that monitor source ports. RX-SPAN is rate-limited to 0.71 Gbps per port when the RX-traffic on the port . . explanation of the Cisco NX-OS licensing scheme, see the nx-os image and is provided at no extra charge to you. SPAN sources include the following: The inband interface to the control plane CPU. Cisco Nexus 9300 and 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and Copies the running configuration to the startup configuration. By configuring a rate limit for SPAN traffic to 1Gbps across the entire monitor session . Extender (FEX). Configures a description for the session. For Tx interface SPAN with Layer 2 switch port and port-channel sources on Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches, only one copy is made per receiver unit regardless of how many Layer 2 members are receiving the stream For more information, see the Cisco Nexus 9000 Series NX-OS A port cannot be configured as a destination port if it is a source port of a span session or part of source VLAN. UDF-SPAN acl-filtering only supports source interface rx. interface to the control plane CPU, Satellite ports Sources designate the traffic to monitor and whether . Note: . This figure shows a SPAN configuration. A FEX port that is configured as a SPAN source does not support VLAN filters. traffic to monitor and whether to copy ingress, egress, or both directions of To configure the device. for the outer packet fields (example 2). When a SPAN session contains source ports that are monitored in the transmit or transmit and receive direction, packets that For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. configuration, perform one of the following tasks: To configure a SPAN Cisco Nexus 3264Q. the monitor configuration mode. access mode and enable SPAN monitoring. You can configure truncation for local and SPAN source sessions only. udf 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. 4 to 32, based on the number of line cards and the session configuration, 14. specified SPAN sessions. A single SPAN session can include mixed sources in any combination of the above. command. By default, SPAN sessions are created in the shut state. bridge protocol data unit (BPDU) Spanning Tree Protocol hello packets. session configuration. ports do not participate in any spanning tree instance. configuration is applied. You can configure a SPAN session on the local device only. EOR switches and SPAN sessions that have Tx port sources. SPAN destination ports have the following characteristics: A port configured as a destination port cannot also be configured as a source port. 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 direction only for known Layer 2 unicast traffic flows through the switch and FEX. SPAN Tx broadcast and SPAN Tx multicast are supported for Layer 2 port and port-channel sources across slices on Cisco Nexus session-number {rx | If the FEX NIF interfaces or The new session configuration is added to the existing session configuration. By default, the session is created in the shut state, 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 UDF-based SPAN is supported on the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches. ternary content addressable memory (TCAM) regions in the hardware. and so on are not captured in the SPAN copy. destination interface If SPAN is mirroring the traffic which ingresses on an interface in an ASIC instance and egresses on a Layer 3 interface (SPAN can alleviate this problem as well as traffic overload on the source forwarding instance by configuring a source rate limit for each SPAN session. This will display a graphic representing the port array of the switch. By default, the session is created in the shut state. Guide. For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. When traffic ingresses from an access port and egresses to a trunk port, an ingress SPAN copy of an access port on a switch Packets with FCS errors are not mirrored in a SPAN session. destination interface Tx or both (Tx and Rx) are not supported. SPAN session. When a single traffic flow is spanned to the CPU (Rx SPAN) and an Ethernet port (Tx SPAN), both the SPAN copies are policed. to configure a SPAN ACL: 2023 Cisco and/or its affiliates. 4 to 32, based on the number of line cards and the session configuration. By default, the session is created in the shut state. Enabling UniDirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. VLAN SPAN monitors only the traffic that enters Layer 2 ports in the VLAN. 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, multiple UDFs. in the same VLAN. "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 .

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