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I’m sure you’ve all logged into a VPN Router once or twice and seen this syslog: %IOSXE-3-PLATFORM: R0/0: cpp_cp: QFP:0.0 Thread:000 TS: %IPSEC-3-REPLAY_ERROR: IPSec SA receives anti-replay error, DP Handle X, src_addr x.x.x.x, dest_addr y.y.y.y, SPI 0x0 Here is everything you need to know regarding the feature, the causes of the syslog, and the solutions …
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Here’s a quick post highlighting the most important fact about bundle vs install mode. Bundle mode (the old style of using a .bin and booting off of that), mounts the image in memory. Thus it uses up as much memory (RAM) as the image is in size. While install mode (the new style with packages.conf), …
This guide is the simplest way to route between 2 VRFs on a Cisco router. I didn’t invent this method as someone showed it to me. Here’s the GNS3 project + images if you want to follow along. https://upw.io/3uh/route-between-vrfs.gns3project Essentially IOU1 is the client with 192.168.1.1, and the default gateway is IOU2. IOU2 PATs …
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This post will show you how to fix the LACP “BUG” on the NX-OSv 9000 so that you can LACP to whatever devices you want. Thus you will be able to practice VPC topologies! If you need the NX-OS 9000 image for GNS3 go here: https://upw.io/wa/nxosv-final.7.0.3.I7.2.qcow2 For documentation on how to add the NX-OSv 9000 …
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I’d like to preface this by saying on the nexus platform storm-control by default does not actually errdisable the port (I believe in catalyst it did). We can just have it syslog and generate an SNMP trap. en conf t event manager environment _email_to [email protected] event manager environment _email_server x.x.x.x event manager environment _email_from [email protected] …
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OSPF offers us 4 kinds of authentication when studying the CCNA and CCNP we really only hear/read about 3, the fourth SHA, is fairly new. Here’s the complete list of available authentication for OSPF. NULL (no authentication) cleartext (packet capture reveals the password) MD5 (creates a 128bit fingerprint of the password, click here to read …
Continue reading “How to Configure OSPF Authentication – Complete Guide”