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Static routes are routes that are manually configured and entered into the routing table. All rights reserved. Help us improve your experience. Let us know what you think.

juniper static route retain

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Static Routing Configuration Guide with Examples

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May we contact you if necessary? Need product assistance? Contact Juniper Support. The switch uses static routes: When the switch does not have a route to a destination that has a better lower preference value. The preference is an arbitrary value in the range from 0 through that the software uses to rank routes received from different protocols, interfaces, or remote systems. The routing protocol process generally determines the active route by selecting the route with the lowest preference value.

In the given range, 0 is the lowest and is the highest. When the switch cannot determine the route to a destination. When the switch is forwarding unroutable packets. To configure basic static route options using the CLI: To configure the switch's default gateway: [edit] user switch set routing—options static route 0. Previous Page Next Page.Statement introduced in Junos OS Release 9.

Statement introduced in Junos OS Release Configure statically configured routes to be deleted from or retained in the forwarding table when the routing protocol process shuts down normally.

You cannot configure both retain and resolve options for a statically configured route because resolved next hops cannot be retained. Statically configured routes are deleted from the forwarding table when the routing protocol process shuts down normally.

By default, the default route retention policy is no-retain for the configured scope using the defaults configuration statement.

This default retention policy is overridden on a per route basis using the routes option. The default retention policy for a route is the policy of its routing table.

Protocol-Independent Routing Properties User Guide

Help us improve your experience. Let us know what you think. Do you have time for a two-minute survey? Maybe Later. To explicitly specify that routes be deleted from the forwarding table, include the no-retain statement. Include this statement when configuring an individual route in the route portion of the static statement to override a retain option specified in the defaults portion of the statement.

Doing this greatly reduces the time required to restart a system that has a large number of routes in its routing table. Related Documentation static.R1 must retain the static route Am i reading it correctly? Configure statically configured routes to be deleted from or retained in the forwarding table when the routing protocol process shuts down normally.

Go to Solution. The option you are looking for is passive. This will change the route to reject keeping it in the table when the interface is down.

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Search instead for. Did you mean:. Static route with Retain Option. Hi everyone. Please consider the following example: H Thanks and have a nice weekend!! Hierarchy Level [edit routing-options static defaults route ] Description Configure statically configured routes to be deleted from or retained in the forwarding table when the routing protocol process shuts down normally. Doing this greatly reduces the time required to restart a system that has a large number of routes in its routing table.Given the attached diagram, I need to be able to configure a route to Null Discard in the following scenario Note: I can configure discard for an unwanted route but this is different :.

No problem. However, we have a situation we believe where if the connection to CPE Customer A goes down the route may loop between the Core routers not sure but what we need to happen, in that circumstance, if for the route to traffic to be dropped. But this should only happen if we LOSE that connectivity.

Go to Solution. The routes to the dynamic LNS interfaces will be through the default route advertised through IS-ISso I guess I need to be able to route these destinations to "discard" if they are not in the routing table. Just create aggregate route with next-hop as discard. Sign In. Global Communities.

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static route to multipoint st0.0 does not show up in routing table

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Showing results for. Search instead for. Did you mean:. Route to Null Discard. Best way to resolve this please? Message 1 of 4 1, Views. All forum topics Previous Topic Next Topic.

Best way to achieve this please? As always, I will investigate and test but thought I would ask.In case you wondered how to redistribute static routes into dynamic routing protocol you are at the right place. This is normally a basic thing to do, but I will let you know how to do it in different ways on different vendor devices so it might be interesting.

We will go through few examples of normal static to OSPF redistribution and then see how it can be partially done with only part of static routes using route filters.

juniper static route retain

But you need to know that this simple command will take all static router available on that router and push them to OSPF and redistribute them to all other routers participating in that OSPF process.

If you want to redistribute just some of the static routes, or in our next example only static route towards the network We create an access-list with which we will reference to that network and then use that access-list inside route-map. Route-map will then be referenced in redistribution command:. IF we need more granular matching on prefix length, we can use prefix-list instead of access-list. In our example, if we want to redistribute all static routes into OSPF we are creating something like this:.

If fo example we want to redistribute into OSPF only Static Route Load Balance.

Route to Null (Discard)

Source-Specific Multicast Configuration. Juniper vMX Multicast Configuration.

Configuring BFD for Static Routes

What is route recursion. I follow you on twitter and your blog and I am a fan. Thank you for always sharing. I have a couple corrections to this post. I only do this because I care.

juniper static route retain

You have a great blog and I want to help make sure the documentation is correct. For example if the below was entered the problems are two fold:! I will update the article to get things right. I was actually doing those things on Juniper at the time and put the Cisco part as a reference.

I wrote Cisco part from my head without labbing it first, which, as we can see, is not always the best thing to do. This site uses Akismet to reduce spam.A static default route is in essence a gateway of last resort used to send traffic destined to any unknown destination to a specific device.

Commonly default routes are used at the internet edge to forward traffic to the ISP. This lab will discuss and demonstrate the configuration of a basic static default route. I n smaller networks there may not be a need for dynamic routing such as a small remote office for example.

In cases like this a single default route is only needed to ensure that traffic destined to network that is not locally found in the routing table is forwarded to. A default route functions as a catch all using the 0. For the purposes of this lab lets imagine you have a small office outside of New York City. If you were to look at this using the show configuration command you would easily be able to identify the default static route as followed.

A default static route is in essence just a static route but uses the special destination network of 0. Keep in mind that if you have longer match routes in the routing table than the router will still perform routing based on the longest match. Section 6 will go further into detail with static routing.

You can view additional details regarding the static default route by appending detail to the show route command as shown below. Now that you have a foundational understanding of how to configure and verify static default routing you should give it a try!

Check out the lab topology and load the required initial configs before attempting the lab objectives. The following logical topology is only used in lab Keep in mind this is a logical topology only. To view the physical topology please check out the Junos Workbook Topology page.

Prior to starting this lab please zeroize all lab devices. Afterwards log in using the root account and start a CLI session and load the following initial configurations by copying and pasting them into the device console.

You need to establish a console session to R1 and R2 and log into the device using the root account or a user account with super-user privileges.

It is recommended that you attempt to complete these lab objectives the first time without looking at the Lab Instruction section. If you are a student preparing for the Juniper JNCIA Certification Exam than you are more likely to remember how to complete these objectives if you attempt to complete them the first time on your own with the use of the core knowledge section found in this lab. You should only resort to the Lab Instruction section to verify your work.

Configure a default route on R1 with the next hop value of Verify the default route in the routing table and by pinging the public IP address 4. Logical Lab Topology The following logical topology is only used in lab Initial Configurations Prior to starting this lab please zeroize all lab devices.Hi all, let me begin by saying my networking skills are not very good.

I completed my JNCIA certification many years ago but due to the nature of my work since then I have never really been tasked with any network administration, so forgive me if I do not make much sense - if you need any further clarification please let me know and I will do my best to answer. We have 3 sites, 1 in Australia, 1 in Malaysia, 1 in China. We also have a cloud environment AWS. These 4 sites are connected by site-to-site VPN's and everything was working fine up until about 2 weeks ago when all of a sudden or China office could no longer establish VPN with AWS.

I have gone through various troubleshooting methods with AWS and the only answer they could give me was that their endpoint was receiving Phase 1 proposal and responding but our Juniper SSG on-site in China did not receive response and eventually timed out. I figure if this is possible I would need to setup some sort of static route however this is where I get a bit lost. I assume I may be way off, but if someone can point me in right direction I would be eternally grateful!

Go to Solution. This will require changes on both nodes of this VPN. But if it is policy based you also need to add the AWS subnet to the traffic selectors here. Finally, you will need to look at the security policies in place at both sites. Policies are written from zone to zone in the direction that traffic is initiated. Likewise on both China and Malaysia the vpn traffic security policy needs to allow the AWS subnets between the two sites on both sides in the correct direction of zone to zone.

There is a similar entry here for the Malaysia Then it times out. I've made sure that route maps we have setup which are attached to various interfaces on Malaysia firewall for example the BGP route to AWS allow for Trying to map it out logically, I still cant understand how the SSG in Malaysia differentiates between traffic between it and China and traffic from China meant for AWS and I assume that this is why the traceroute times out, it just doesnt know where to send it?

Do I need to configure something to allow this? You mentioned I could probably do it via policy, however as these are route-based there isnt a policy assigned to them? Thanks again for your response, and your patience, after this I fully intend to go back over some networking basics because I am drawing blanks when it comes to this!

Sounds like your routing is good now.

juniper static route retain

Routing only cares about the destination address of the packet. So in Malaysia any source address with a destination of AWS will be routed to the tunnel. And any source address with a destination of China will be routed to that tunnel. Check the phase 2 configuration and make sure there are no proxy-id pairs configured that limit the tunnel. This is likely ok. Next we confirm the security policy allows the traffic.

The vpn tunnel interface from China is the source zone and the vpn tunnel interface to AWS is the destination zone. You need a policy to permit traffic between these zones for China to ping AWS. And a reverse zone policy to allow AWS to ping China. If you cannot see this manually, setup debug flow basic on the Malyasia SSG and run the ping again from China. The results will tell us what policies are in place and probably blocking the traffic. You can interpret the results here or post the file.

Not long after my response I noticed the routing working correctly as I needed it to. I believe this may have been because I deleted the VPN configuration from AWS side and instead attached the subnet of the China network and attached it to the virtual gateway in effect forcing AWS to look for that network through one of the other endpoints Malaysia specifically. It didnt happen straight away but after spending all day on it I had an early night and next morning when I woke up to continue on it found it to be working perhaps route tables took a while to propagate?

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