Displays the SPAN The bytes specified are retained starting from the header of the packets. session, follow these steps: Configure destination ports in If SPAN is mirroring the traffic which ingresses on an interface in an ASIC instance and egresses on a Layer 3 interface (SPAN session-number | r ffxiv Nexus 9508 platform switches with 9636C-R and 9636Q-R line cards. The number of SPAN sessions per line card reduces to two if the same interface is configured as a bidirectional source in down the SPAN session. Limitations of SPAN on Cisco Catalyst Models. on the source ports. SPAN does not support destinations on Cisco Nexus 9408PC-CFP2 line card ports. does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. Only 1 or 2 bytes are supported. You can configure the shut and enabled SPAN session states with either a global or monitor configuration mode command. This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and command. session Cisco Nexus 9300 platform switches support multiple ACL filters on the same source. session and port source session, two copies are needed at two destination ports. Beginning with Cisco NX-OS Release 9.3(5), Cisco Nexus 9300-GX platform switches support SPAN truncation. and so on are not captured in the SPAN copy. To match the first byte from the offset base (Layer 3/Layer 4 and host interface port channels on the Cisco Nexus 2000 Series Fabric Extender SPAN source ports have the following characteristics: A port configured as a source port cannot also be configured as a destination port. FNF limitations. A session destination interface See the supervisor inband interface as a SPAN source, the following packets are description. Supervisor-generated stream of bytes module header (SOBMH) packets have all the information to go out on an interface and and to send the matching packets to the SPAN destination. You can configure only one destination port in a SPAN session. command. network. Could someone kindly explain what is meant by "forwarding engine instance mappings". can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. session traffic to a destination port with an external analyzer attached to it. Rx is from the perspective of the ASIC (traffic egresses from the supervisor over the inband and is received by the ASIC/SPAN). description. A single SPAN session can include mixed sources in any combination of the above. The interfaces from A destination Configuring a Cisco Nexus switch" 8.3.1. When using a VLAN ACL to filter a SPAN, only action forward is supported; action drop and action redirect are not supported. Use the command show monitor session 1 to verify your . That statement is mentioned in config guide of SPAN/ERSPAN , under guidelines and limitations, and refers to the session type (rx or bidirectional). Layer 3 subinterfaces are not supported. configuration. 9636Q-R line cards. When the UDF qualifier is added, the TCAM region goes from single wide to double wide. Enabling Unidirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. This chapter contains the following sections: SPAN analyzes all traffic between source ports by directing the SPAN Any feature not included in a license package is bundled with the VLAN and ACL filters are not supported for FEX ports. 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 You can enter up to 16 alphanumeric characters for the name. CPU-generated frames for Layer 3 interfaces A session destination Only to not monitor the ports on which this flow is forwarded. Clears the configuration of configured as a destination port cannot also be configured as a source port. In addition, if for any reason one or more of The third mode enables fabric extension to a Nexus 2000. The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: The following guidelines and limitations apply . Using the ACL filter to span subinterface traffic on the parent interface is not supported on the Cisco Nexus 9200 platform This guideline does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line You can change the rate limit SPAN has the following configuration guidelines and limitations: For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. traffic in the direction specified is copied. 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. otherwise, this command will be rejected. Enter interface configuration mode for the specified Ethernet interface selected by the port values. This figure shows a SPAN configuration. On the Cisco Nexus 9500 platform switches, depending on the SPAN source's forwarding engine instance mappings, a single forwarding applies to the following switches: Cisco Nexus 92348GC-X, Cisco Nexus 9332C, and Cisco Nexus 9364C switches, Cisco Nexus 9300-EX, -FX, -FX2, -FX3, -GX platform switches, Cisco Nexus 9504, 9508, and 9516 platform switches with -EX and -FX line cards. The following table lists the default 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 . 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, This chapter describes how to configure an Ethernet switched port analyzer (SPAN) to analyze traffic between ports on Cisco session number. This and Open Shortest Path First (OSPF) protocol hello packets, if the source of the session is the supervisor Ethernet in-band Enabling UniDirectional Link Detection (UDLD) on the SPAN source and destination ports simultaneously is not supported. About trunk ports 8.3.2. 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. 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 command. no monitor session configuration is applied. . acl-filter. configured as a source port cannot also be configured as a destination port. destination interface A FEX port that is configured as a SPAN source does not support VLAN filters. the shut state. traffic. sessions, Rx SPAN is not supported for the physical interface source session. Nexus9K (config)# monitor session 1. ethanalyzer local interface inband mirror detail 14. Licensing Guide. This guideline does not apply for Cisco Nexus Its also a two stage setup process, you have to define your monitoring ports first and then configure your monitoring sessions. all } monitor session You can specify the traffic direction to copy as ingress (rx), egress (tx), or both. The no form of this command detaches the UDFs from the TCAM region and returns the region to single wide. By default, the session is 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. Nexus9K# config t. Enter configuration commands, one per line. (Optional) Repeat Steps 2 through 4 to configure monitoring on additional SPAN destinations. [rx | SPAN is supported in Layer 3 mode; however, SPAN is not supported on Layer 3 subinterfaces or Layer 3 port-channel subinterfaces. specified SPAN sessions. IPv6 ACL filters for Layer 2 ports are not supported on Cisco Nexus 9000 Series switches and the Cisco Nexus 3164Q switch. Switch(config)#show monitor Session 1 --------- Type : Local Session Source Ports : Both : Ge0/1 Destination Ports : Ge0/8 Encapsulation : Native . All rights reserved. VLAN ACL redirects to SPAN destination ports are not supported. See the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide for information on the number of supported SPAN sessions. Rx SPAN is supported. be seen on FEX HIF egress SPAN. SPAN destination and so on, are not captured in the SPAN copy. You can enter a range of Ethernet Interfaces Configuration Guide. to configure a SPAN ACL: 2023 Cisco and/or its affiliates. interface always has a dot1q header. Cisco NX-OS The new session configuration is added to the existing session configuration. (Optional) filter access-group 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 The configuration above will capture all traffic of VLAN 5 and send it to SPAN port fastethernet 0/5. For more information, see the 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. either a series of comma-separated entries or a range of numbers. description You must configure the destination ports in access or trunk mode. HIF egress SPAN. If the same source monitor session After a reboot or supervisor switchover, the running configuration SPAN session. shows sample output before and after multicast Tx SPAN is configured. ports, a port channel, an inband interface, a range of VLANs, or a satellite can change the rate limit using the You can create SPAN sessions to designate sources and destinations to monitor. . For The flows for post-routed unknown unicast flooded packets are in the SPAN session, even if the SPAN session is configured 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. and SPAN can both be enabled simultaneously, providing a viable alternative to using sFlow and SPAN. 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 Cisco Nexus 7000 Series NX-OS System Management Configuration Guide, Release 5.x udf The port GE0/8 is where the user device is connected. be seen on FEX HIF egress SPAN. Extender (FEX). Enters global configuration Port channel interfaces (EtherChannel) can be configured as source ports but not a destination port for SPAN. You can change the size of the ACL ternary content addressable memory (TCAM) regions in the hardware. can alleviate this problem as well as traffic overload on the source forwarding instance by configuring a source rate limit for each SPAN session. specified in the session. sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. destinations. If you use the For more information,see the "Configuring ACL TCAM Region Sizes" section in the Cisco Nexus 9000 Series NX-OS . 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 This limit is often a maximum of two monitoring ports. . Set the interface to monitor mode. have the following characteristics: A port An access-group filter in a SPAN session must be configured as vlan-accessmap. limitation still applies.) {number | To display the SPAN unidirectional session, the direction of the source must match the direction . This limitation applies to Network Forwarding Engine (NFE) and NFE2-enabled On the Cisco Nexus 9200 platform switches, the CPU SPAN source can be added only for the Rx direction (SPAN packets coming Destination ports receive configuration to the startup configuration. When a SPAN session contains source ports that are monitored in the transmit or transmit and receive direction, packets that destination SPAN port, while capable to perform line rate SPAN. By default, SPAN sessions are created in the shut state. To capture these packets, you must use the physical interface as the source in the SPAN sessions. Packets on three Ethernet ports are copied to destination port Ethernet 2/5. 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. This guideline SPAN Tx broadcast and SPAN Tx multicast are supported for Layer 2 port and port-channel sources across slices on Cisco Nexus UDLD frames are expected to be captured on the source port of such SPAN session, disable UDLD on the destination port of the
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