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VSS Preemption allow switch with higher priority configured to initiate a switchover to become active if it comes up in standby state after a reload or a switchover. •Do not use the log keyword in CoPP policy ACLs. ARP policing mechanisms provide protection against ARP storms. •Which ports have negotiated half-duplex links. •CoPP does not support non-IP classes except for the default non-IP class. For more information on the spanning-tree bpduguard command on the Catalyst 4500, refer to the following URL: http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/31sg/command/reference/snmp_vtp.html#wp1065041. Wherever possible, you should utilize > or = 2 port Multi-chassis Ether-Channels (MECs) to connect to all of your PIM (or PIM Snooping) neighbors, L2 (IGMP Snooping-capable) switches, and LACP-capable Network Interface Cards (NICs). •With the default port security configuration, enter the errdisable recovery cause psecure-violation global configuration command to automatically bring secure ports out of the error-disabled state, or manually reenable ports by entering the shutdown and no shut down interface configuration commands. The selection of Centralized and Distributed mode of forwarding plays an important role. •If IGMP snooping is disabled but RGMP is enabled. Multicast creates copies of the traffic only when the links to the destinations diverge. Although the window of 0.03 seconds may seem small, it translates to a large loss on a high bandwidth 10GE port such as the Virtual Switch Link (VSL). The control plane policing (CoPP) feature increases security on the switch by protecting the RP from unnecessary or DoS traffic and giving priority to important control plane and management traffic. Proper Routing protocol design have numerous benefits that helps in keeping check on CPU utilization, traffic flowing across the VSL link, convergence and predictable flow of traffic. Use a unique domain-ID ranging from 1 to 255 within the network. These sections describe best practices for CoPP Support for ISIS: •Features Incompatible with CoPP Support for ISIS, •Guidelines and Restrictions for CoPP Support for ISIS, •Recommended CoPP Support for ISIS Configuration, •Configuration Guide for CoPP Support for ISIS. An example is shown in the following: The configuration makes the port a non-trunking, non-tagged single VLAN Layer 2 interface. A warning message is displayed to inform you that egress QoS and CoPP cannot be configured at the same time. If you have > 50 PIM neighbors, use the default (30 seconds) PIM query-interval. Filtering this traffic could prevent remote access to the switch, requiring a console connection. This procedure allows you to identify errors that need to be submitted to the Cisco TAC for further analysis. •With releases earlier than Release 12.2(18)SXE, port security does not support IEEE 802.1Q tunnel ports. Per VLAN Spanning Tree Plus (PVST+) provides the same functionality as PVST using 802.1Q trunking technology rather than ISL. In rare case where both chassis later become inactive and then start up with the second or different supervisor engine becoming the initial active supervisor engine, the VSS will start up with a router MAC address from that respective chassis. If L3 MEC is used, the traffic convergence is instant. See this publication for more information about software and configuration backup: http://www.cisco.com/en/US/docs/ios/fundamentals/configuration/guide/cf_config-files.html. See this publication for more information about Smart Call Home: http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/callhome.html. Such information can be abused by malicious users. Note Do not configure the Cisco IOS software firewall features, which are supported in some releases and which run in software with very limited hardware support. One of the best practices in network security is to try and stop security threats from the entry-point of a LAN network. After a switchover to the second chassis, the VSS continues to use the MAC address from the previously active chassis as the router MAC address. Per-VLAN Spanning Tree (PVST) is a feature available on Catalyst 6500 and 4500 Series switches that implements a separate instance of spanning tree for each VLAN configured in the network. This example configuration enables management session access control: This configuration example enables SCP services: See this publication for more information about Secure Shell (SSH): http://www.cisco.com/en/US/docs/ios/security/configuration/guide/sec_cfg_secure_shell.html. Note The addresses shown in these ACEs are only examples. IP-BFD dual-active detection is only supported on Gigabit Ethernet ports and the three Gigabit Ethernet uplink ports on the Supervisor Engine 720-10G VSS have to be shutdown to enable 10G-only mode. As in centralized mode the amount of traffic passing through the VSL depends on the which switch is the active switch. VSS converts two physical chassis into one logical device. All that is required is for ports to be marked indicating they are part of a VLAN QoS policy and to apply the policy on the SVI. When the routing protocol packets ingress the Standby switch, they need to traverse the VSL links in order for them to reach the Active RP on the Active Switch. •Additionally, ensure that those ports are configured in the interface exclusion list and do not participate in the dynamic routing process as network inconsistency may occur during dual-active condition. These sections describe best practices for GOLD Tcl Script Template: Note Release 12.2(33)SXH and later releases support embedded event manager (EEM) Tcl scripting for GOLD. This ensures that a root bridge will never be negotiated on those ports. 2. If you cannot establish a link, use the TDR to conduct in-place testing that determines if the cabling is at fault. Note 198.2.1.0 is the management network and 102.1.24.2 and 102.3.24.2 are the IP addresses of the next-hop router. VSLP timers can be configured to change the transmission interval between hello messages across VSL links. These sections describe best practices for the TDR: The TDR detects a cable fault by sending a signal through the cable and reading the signal that is reflected back to it.

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