Cisco 11503 Administration Guide - Page 165

Chapter 4 Using the CSS Logging Features Frequently Queried Log Messages Table 4-8 Cisco 11500 Series CSS Log Messages (continued) Log Message (sys.log: Subsystem Name, Level, and Message) Cause and Resolution IPV4-4: Ipv4SfmArpTx: unknown circuit in buffer (2001) An ARP TX task is running on the SFM, receiving packets from the SFM and transmitting them to the proper egress ports. This message includes the circuit number (2001, in this example). If the circuit number for this ARP was down or inactive while the ARP was still being queued in the SFM, the message would appear in the log. An action caused the circuit to be removed while data for the circuit was still in the buffer. Determine whether all physical interfaces in a circuit VLAN are going up and down, or a configuration change occurred on the VLAN at the time of the message. IPV4-4: Ipv4SfmForwRx: bad IP version received (0) The IPV4 receive task received a packet and the IP version is displayed in parentheses (). The CSS discards any packet that is not Ipv4 version 4. In this example, the IP version is 0. If you see many of these messages, the problem could be an improperly configured device or a DoS attack. IPV4-4: Ipv4SfmForwTx: No VC for buffer (0x00000000) The IPV4 transmit task has a buffer to transmit to the switch fabric processor, however the CSS still needs to create the Virtual Circuit to the fastpath. This message typically occurs if the CSS Ethernet port changes state. This is an informational message. No further action is required. OL-5647-02 Cisco Content Services Switch Administration Guide 4-45