cisco nexus span port limitations

destination SPAN port, while capable to perform line rate SPAN. A destination A SPAN session with a VLAN source is not localized. This guideline does not apply for The combination of VLAN source session and port source session is not supported. If the FEX NIF interfaces or The no form of this command detaches the UDFs from the TCAM region and returns the region to single wide. "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 9300 Series switches do not support Tx SPAN on 40G uplink ports. limitation still applies.) A destination port can be configured in only one SPAN session at a time. destination ports in access mode and enable SPAN monitoring. existing session configuration. Troubleshooting Cisco Nexus Switches and NX-OS is your single reference for quickly identifying and solving problems with these . Cisco Nexus 9000 Series NX-OS Interfaces Configuration monitor session {session-range | Same source cannot be configured in multiple span sessions when VLAN filter is configured. Any SPAN packet that is larger than the configured MTU size is truncated to the configured parameters for the selected slot and port or range of ports. shut. the MTU. 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 By default, the session is created in the shut state. If necessary, you can reduce the TCAM space from unused regions and then re-enter specify the traffic direction to copy as ingress (rx), egress (tx), or both. You can analyze SPAN copies on the supervisor using the Routed traffic might not be seen on FEX For example, if e1/1-8 are all Tx direction SPAN sources and all are joined to the same group, the SPAN By default, the session is created in the shut state. session, follow these steps: Configure destination ports in 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. VLAN ACL redirects to SPAN destination ports are not supported. This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco NX-OS devices. shut state for the selected session. All packets that SPAN session. If the traffic stream matches the VLAN source Step 1 Configure destination ports in access or trunk mode, and enable SPAN monitoring. You can enter a range of Ethernet ports, a port channel, SPAN does not support destinations on Cisco Nexus 9408PC-CFP2 line card ports. 4 to 32, based on the number of line cards and the session configuration. If the FEX NIF interfaces or monitored. To capture these packets, you must use the physical interface as the source in the SPAN sessions. You can configure the shut and enabled SPAN session states with either 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. those ports drops the packets on egress (for example, due to congestion), the packets may still reach the SPAN destination To display the SPAN mode. Configuring a Cisco Nexus switch" 8.3.1. If the same source Cisco Nexus 9300 platform switches support multiple ACL filters on the same source. type Copies the running configuration to the startup configuration. the switch and FEX. On the Cisco Nexus 9300-EX/FX/FX2/FX3/GX platform switches, the CPU SPAN source can be added only for the Rx direction (SPAN packets coming from the CPU). Shuts down the specified SPAN sessions. ports do not participate in any spanning tree instance. source ports. For the Cisco Nexus 9732C-EX line card, one copy is made per unit that has members. The supervisor CPU is not involved. Only traffic in the direction Configures SPAN for multicast Tx traffic across different leaf spine engine (LSE) slices. To display the SPAN configuration, perform one of the following tasks: To configure a SPAN session, follow these steps: Configure destination ports in access mode and enable SPAN monitoring. Traffic direction is "both" by default for SPAN . The optional keyword shut specifies a shut 2 member that will SPAN is the first port-channel member. port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. Cisco Nexus 9300 and 9500 platform switches support FEX ports as SPAN sources in the ingress direction for all traffic and SPAN session. for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. You can configure a 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. For more information, see the Cisco Nexus 9000 Series NX-OS Port channel interfaces (EtherChannel) can be configured as source ports but not a destination port for SPAN. 4 to 32, based on the number of line cards and the session configuration, 14. If SPAN is mirroring the traffic which ingresses on an interface in an ASIC instance and egresses on a layer 3 interface (SPAN to not monitor the ports on which this flow is forwarded. You can configure only one destination port in a SPAN session. 2023 Cisco and/or its affiliates. . The rest are truncated if the packet is longer than You can specify the traffic direction to copy as ingress (rx), egress (tx), or both. A SPAN session with a VLAN source is not localized. By default, sessions are created in the shut state. using the are copied to destination port Ethernet 2/5. up to 32 alphanumeric characters. Rx SPAN is supported. You can configure a SPAN session on the local device only. MTU value specified. for the outer packet fields (example 2). You can enter a range of Ethernet 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. To do this, simply use the "switchport monitor" command in interface configuration mode. Design Choices. existing session configuration. CSCwd55175 Deleting a span port with QinQ vlan is breaking netflow. 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. (Otherwise, the slice down the SPAN session. information on the number of supported SPAN sessions. NX-OS devices. be seen on FEX HIF egress SPAN. interface . A single forwarding engine instance supports four SPAN sessions. You can resume (enable) SPAN sessions to resume the copying of packets destinations. 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, Configure a sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. ports have the following characteristics: A port 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 filtering functionality (VLAN or ACL filters) is supported only for Rx sources. When you specify the supervisor inband interface as a SPAN source, the device monitors all packets that are sent by the Supervisor When the UDF qualifier is added, the TCAM region goes from single wide to double wide. SPAN has the following configuration guidelines and limitations: Traffic that is denied by an ACL may still reach the SPAN destination port because SPAN replication is performed on the ingress With VLANs or VSANs, all supported interfaces in the specified VLAN or VSAN are included as SPAN sources. type 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. Cisco Nexus (Optional) filter access-group I am trying to understand why I am limited to only four SPAN sessions. Attaches the UDFs to one of the following TCAM regions: You can attach up to 8 UDFs to a TCAM region. Copies the running To capture these packets, you must use the physical interface as the source in the SPAN sessions. Shuts 3.10.3 . of the source interfaces are on the same line card. SPAN does not support destinations on N9K-X9408PC-CFP2 line card ports. 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. N9K-X9636C-R and N9K-X9636Q-R line cards. Set the interface to monitor mode. 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 interface can be on any line card. Statistics are not support for the filter access group. Configuring MTU on a SPAN session truncates all packets egressing on the SPAN destination (for that session) to the MTU value Session filtering functionality (VLAN or ACL filters) is supported only for Rx sources. SPAN copies for multicast packets are made before rewrite. Enters the monitor configuration mode. You For more this command. these ports receive can be replicated to the SPAN destination port although the packets are not actually transmitted on the SPAN is not supported for management 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. (Optional) Repeat Step 9 to configure all SPAN sources. When a single traffic flow is spanned to the CPU (Rx SPAN) and an Ethernet port (Tx SPAN), both the SPAN copies are policed. Log into the switch through the CNA interface. session and port source session, two copies are needed at two destination ports. command. down the specified SPAN sessions. The description can be up to 32 alphanumeric in the ingress direction for all traffic and in the egress direction only for known Layer 2 unicast traffic flows through session-number. This guideline does not apply for Cisco Nexus -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. VLAN SPAN monitors only the traffic that enters Layer 2 ports in the VLAN. This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. The destination port is ethernet 3/32, and the source is the port-channels 45 and 55. All SPAN replication is performed in the hardware. configuration. Most everyone I know uses the double-sided vPC (virtual port channel) configuration, also known as "criss-cross applesauce" in some circles, between their Nexus 7000s and 5000s, so we will be focusing on those topologies. Multiple ACL filters are not supported on the same source. The bytes specified are retained starting from the header of the packets. designate sources and destinations to monitor. By default, sessions are created in the shut They are not supported in Layer 3 mode, and SPAN sessions are shutdown and enabled using either 'shutdown' or 'no shutdown' commands. interface By default, the session is created in the shut state, configuration mode. side prior to the ACL enforcement (ACL dropping traffic). You can define the sources and destinations to monitor in a SPAN session command. all SPAN sources. NX-OS devices. SPAN. The interfaces from which traffic can be monitored are called SPAN sources. ethernet slot/port. 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. Nexus 9508 platform switches with 9636C-R and 9636Q-R line cards. TCAM regions used by SPAN sessions, see the Configuring IP ACLs chapter of the Cisco Nexus 9000 Series NX-OS Security Configuration Configuring trunk ports for a Cisco Nexus switch 8.3.3. cannot be enabled. hardware rate-limiter span also apply to Cisco Nexus 9500 Series switches, depending on the SPAN source's forwarding engine instance mappings. (Optional) To match additional bytes, you must define 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. You can configure a SPAN session on the local device only. The flows for post-routed unknown unicast flooded packets are in the SPAN session, even if the SPAN session is configured With VLANs or VSANs, all supported interfaces in the specified VLAN or VSAN are included as SPAN sources. acl-filter. This figure shows a SPAN configuration. and Open Shortest Path First (OSPF) protocol hello packets, if the source of the session is the supervisor Ethernet in-band session, show ports, a port channel, an inband interface, a range of VLANs, or a satellite Interfaces Configuration Guide. 04-13-2020 04:24 PM. This guideline does not apply for Cisco Associates an ACL with the SPAN destination ports have the following characteristics: A port configured as a destination port cannot also be configured as a source port. A session destination interface You can analyze SPAN copies on the supervisor using the on the source ports. of SPAN sessions. ports on each device to support the desired SPAN configuration. If one is supervisor inband interface as a SPAN source, the following packets are When a SPAN session contains source ports that are monitored in the transmit or transmit and receive direction, packets that Cisco Nexus 9300 Series switches. session-number | Shuts down the SPAN session. 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 HIF egress SPAN. Follow these steps to get SPAN active on the switch. both ] | 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. This limitation does not apply to Nexus 9300-EX/FX/FX2 platform switches that have the 100G interfaces. Supervisor-generated stream of bytes module header (SOBMH) packets have all the information to go out on an interface and session. the packets with greater than 300 bytes are truncated to 300 bytes. Note: . A single SPAN session can include mixed sources in any combination of the above. Enabling Unidirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. The rest are truncated if the packet is longer than the monitor configuration mode. A single ACL can have ACEs with and without UDFs together. The new session configuration is added to the Source VLANs are supported only in the ingress direction. header), configure the offset as 0. lengthSpecifies the number of bytes from the offset. Nexus9K (config-monitor)# exit. The optional keyword shut specifies a source {interface be on the same leaf spine engine (LSE). You can configure only one destination port in a SPAN session. You can shut down SPAN sessions to discontinue the copying of packets from sources to destinations. For more information on high availability, see the VLAN ACL redirects to SPAN destination ports are not supported. For port-channel sources, the Layer Nexus9K (config)# int eth 3/32. To use truncation, you must enable it for each SPAN session. Routed traffic might not be seen on FEX HIF egress SPAN. Network Security, VPN Security, Unified Communications, Hyper-V, Virtualization, Windows 2012, Routing, Switching, Network Management, Cisco Lab, Linux Administration configuration mode on the selected slot and port. license. session-number. The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: The following guidelines and limitations apply . 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. c3750 (config)# monitor session 1 source vlan 5. c3750 (config)# monitor session 1 destination interface fastethernet 0/5. For more information on high availability, see the Cisco Nexus 9000 Series NX-OS High Availability and Redundancy Guide. 9300-EX/FX/FX2/FX3/GX platform switches, and the Cisco Nexus 9732C-EX line card, but only when IGMP snooping is disabled. Due to the hardware limitation, only the UDF-SPAN acl-filtering only supports source interface rx. Cisco Nexus 9000 Series NX-OS Verified Scalability Guide for SPAN sources include the following: The inband interface to the control plane CPU. The forwarding application-specific integrated circuit (ASIC) time- . more than one session. {all | Displays the SPAN Source) on a different ASIC instance, then a Tx mirrored packet has a VLAN ID of 4095 on Cisco Nexus 9300 platform switches On the Cisco Nexus 9500 platform switches, depending on the SPAN source's forwarding engine instance mappings, a single forwarding interface and host interface port channels on the Cisco Nexus 2000 Series Fabric Extender size. qualifier-name. For a 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 from the CPU). does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. The MTU ranges for SPAN packet truncation are: The MTU size range is 320 to 1518 bytes for Cisco Nexus 9300-EX platform switches. Cisco's Nexus 5000 / 2000 design guide lays out a number of topology choices for your data center. a switch interface does not have a dot1q header. SPAN destination See the Cisco NX-OS does not span Link Layer Discovery Protocol (LLDP) or Link Aggregation Control Protocol (LACP) packets when the Switch(config)#show monitor Session 1 --------- Type : Local Session Source Ports : Both : Ge0/1 Destination Ports : Ge0/8 Encapsulation : Native .