EIGRP IP FAST REROUTE SOFTWARE UPGRADE
EIGRP IP FAST REROUTE UPGRADE
EIGRP IP FAST REROUTE FULL

In honor of Fast Hellos, let’s enjoy Fast Goodbye.īack to business. So what happens if we get a network change in our area, but we don’t want to do a whole big SPF recalculation? Isn’t there some way that we could just recalculate the bit that got change? Of course there is, it’s called Incremental SPF. Timers pacing lsa-group 600 (this is seconds, it’s the interval at which we gather up our LSAs into a group, refresh them, checksum them, and age them.) SPF Tuning Timers pacing flood 100 (when to flood LSAs, in milliseconds) If we recall, LSAs are grouped up and sent out every thirty minutes on a stable, converged network. Pretty much the same for v2 and v3, but v3 has its own dedicated config page. Timers throttling spf 0 LSA and SPF Throttling for OSPFv3: SPF throttling is pretty similar to LSA throttling, except the start interval means “how long to wait before running the first SPF calculation.” The idea is if things are flapping, you just keep extending the hold-time until you reach the max-timer, then just running it only when that timer exceeds until things stabilize. Timers lsa arrival 500 SPF Throttling (OSPFv2) This value basically says, “If you send me repeat LSAs faster than this time then I’m just going to drop them.” If R1 is sending LSAs every 500 milliseconds, but R2 isn’t willing to accept them any faster than 1 per second, then we’re wasting a lot of R1’s time and resources. This number needs to be equal to or less than the hold interval of the neighbor. Now we need to jump over to the neighbor router and tell it how often it should expect LSAs. This means as our Hold Interval keeps doubling, at some point we want to make it stay at a max value. Max Interval is the longest we’re willing to wait before re-sending an LSA.So if our router’s links are unstable, the first LSA will go out immediately, the second one goes at 200 milliseconds (Start Interval), the third one goes out at the 700 millisecond mark (Start Interval + Hold Interval), the fourth one will go out at the 1700 millisecond mark (Start + Hold + (Hold x 2) The trick here is this time will keep doubling. Hold Interval is the minimum time we’ll wait before sending two consecutive LSAs that are the same, meaning same Router ID, same LSA Type, and same LSA ID.

EIGRP IP FAST REROUTE FULL

The first LSA is sent immediately, but since we’re not waiting 5 full seconds to send the second one, we need to know when to send that next one.

Start Interval means how long do we wait before we send the second LSA of the same type.

The two commands are easy, but the timers and what each timer does can be a little confusing. Second, it has a dynamic feature to slow things down when network instability is detected. Firstly, it’s gets us away from the 5-second rate-limit for LSAs, so we can get millisecond convergence. 1.4.e ii LSA throttling, SPF tuning, fast hello LSA Throttling (OSPFv2) I may come back and move things around later to make it easier to find stuff. I already covered OSPF metrics in the previous post, so I’ll skip it here. Posted by Gregory Leeson NovemNovemPosted in 1.5 BGP, CCIE Enterprise Infrastructure Tags: BGP, CCIE, Cisco, Enterprise Infrastructure Leave a comment on 1.5.a IBGP and EBGP peer relationships 1.4.e Optimization, convergence and scalability (OSPF) If the AS is different between the two peers, then it’s eBGP. Posted by Gregory Leeson JanuJanuPosted in 2.2 SD-WAN Tags: CCIE, Cisco, Enterprise Infrastructure, SD-WAN Leave a comment on Bonus: SD-WAN IOS Upgrade 1.5.a IBGP and EBGP peer relationships Then we get send to the Task View where we can see things are going well.

Since this is a lab and we don’t need a Change Request we’ll check the box to Activate and Reboot.

Select the IOS from the dropdown under Version.

Select vManage, since that’s the repository we set up in the previous steps.

VManage: Select Router and Click Upgrade.

EIGRP IP FAST REROUTE UPGRADE

Select the router to upgrade and click Upgrade.

EIGRP IP FAST REROUTE SOFTWARE UPGRADE

In vManage, go to Maintenance > Software Upgrade > WAN Edge.Find your downloaded IOS file and click Open.

In vManage, go to Maintenance > Software Repository > Software Images > Add New Software.

We’ll just be uploading the image directly to vManage. This will be a quick post on upgrading an ASR IOS using SD-WAN.

Eigrp ip fast reroute