jotfco's tutorials

Recovery EPROM Cookie on Router Cisco

Contributed by jotfco on September 2, 2005 under Cisco router

Sometimes when rains a lighting could damage your router, that’s what happened to me last week.The problem was that the lighting deleted the cookies of my router’s eprom, it contains the data that the bootloader use to determine the MAC address,the CPU version,the vendor etc. Based on this informations the IOS runs or not on the platform, if these cookie are lost (my chase) the router cannot start…..

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RSPAN using CatOS

Contributed by jotfco on May 10, 2005 under Cisco switch

This small guide can be useful if you need to configure the RSPAN session on your Catalyst 6500.In this example we will see how to monitor more than one VLan using the RSPAN vlan. RSPAN has all the features of SPAN plus support for source ports and destination ports distributed across multiple switches, allowing remote monitoring of multiple switches across your network.The traffic for each RSPAN session is carried over a user-specified RSPAN VLAN that is dedicated for that RSPAN session in all participating switches. The SPAN traffic from the sources, which cannot be in the RSPAN VLAN, is switched to the RSPAN VLAN and then forwarded to destination ports configured in the RSPAN VLAN. The traffic type for sources (ingress, egress, or both) in an RSPAN session can be different in different source switches, but is the same for all sources in each source switch for each RSPAN session. Do not configure any ports in an RSPAN VLAN except those selected to carry RSPAN traffic. Learning is disabled on the RSPAN VLAN.

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