Questions tagged [bgp]

BGP is Border Gateway Protocol, used on the internet both inside of and in between networks.

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Introduce BGP payload [closed]

There is a saying: BGP do not have payload by default, the max count is 6. I don't understand this sentence. is it mean 6 bytes? or 6 count data? whether the BGP flowspec is one of BGP's payload?
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Getting VRF to work (and some other questions)

I'm messing with BGP/MPLS for the first time and I have some doubts both in if I'm doing something wrong with my configuration and if it is the best approach, hope you guys can clarify me a bit here. ...
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Routing IPs through another ASN

So currently we have a few /24 ranges that we are looking to use on an upcoming project, we also have an ip circuit with a tier-1 ISP and bgp peering is established. Me and my business partner know ...
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EVPN+VxLAN strange silent host issue

EVPN+VxLAN very strange silent host issue I have very basic EVPN+VxLAN design where i used OSPF/Multicast/BGP/vPC technologies to build small size datacenter. L2VNI working great without any issue. I ...
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MPLS-BGP - VPN isolation - RFC 4364

In Section 6 of RFC-4364, it is stated that, if MPLS is being used as the tunneling technology (in the scope of forwarding VPN-IPV4 traffic from one PE to an other) , this means that a router in the ...
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Can I Announce BGP By Myself? [closed]

I have /24 IP block purchased from APNIC. My ISP is not announcing my ASN. But, they gave me a static public IP that has all ports open. So can I announce my ASN using the live static IP that I have?
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Does JunOS breaks iBGP rules when using several routing instances?

I have setup with several routers where 1 is external eBGP router with 2 iBGP routers. Routes are coming from eBGP peer are landing to Routing-Instance Ext and after that their are moved to inet.0 ...
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ebgp in one broadcast network

can you help me? Why vios4 dont change next-hop(ebgp) when it send 3.3.3.3/32 to vios5? On vios5 i see network 3.3.3.3 with next-hop 192.168.1.3
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BGP running on VLAN interface or loopback0?

The switches mention below are all Cisco. I got sw01 and sw02 running BGP peering with multiple service provider for our internal infrastructure, between sw01 and sw02 have a port-channel group 100. ...
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NAT cannot communicate with 2 network

I have configured BGP for routing and NAT for HQ and Branch. I can ping from windows / server to public IP and also Linux Mint ping to public IP. but, I cannot ping / communicate between network HQ to ...
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Link failure detection between 2 routers

When 2 routers are linked directly together with eBGP between them, how is a link failure detected ? With the BGP timers ? Or faster with some sort of L1 tool? For instance, assume we have the ...
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BGP Best Path Selection Algorithm

According to this cisco document (https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html), shortest AS_PATH is the #4 algorithm in the sequence to evaluate, out of 13 ...
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2 AS in the same box JunOS

Today we have an MX204 and we announced our AS using Juniper, but we also have partnership with another internet provider that has another AS. This other AS has much less client and a much smaller ...
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BGP (RIB-Failure - Higher admin distance)

I tried to make BGP routing on this topology .. After that I added 200.200.10.0 network and 200.200.20.0 network in R1, I had rib-failure (higher admin distance) on R2 and R3 .. but I was able to ping ...
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Juniper keeps a received BGP prefix in hidden state when the BGP next-hop is overwritten to a static route

I have a routing policy named rtbh configured as an ingress policy for a BGP peer: root@PE3> show configuration policy-options policy-statement rtbh term ipv4 | display inheritance no-comments from ...
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BGP prefix filtering mismatch between peers

the peering between our router and the other peer already established, and we are trying to add new prefix route: 192.168.0.0/24 Failing command ip prefix-list PREFIX-FROM-A seq 15 permit 192.168.0.0/...
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BGP “protocol next hop” resolves to different next-hop address than the same IP using ISIS

I have a BGP-learned prefix 130.130.0.0/24 with protocol next hop 10.0.2.5: root@r2> show route 130.130.0.0 detail inet.0: 60 destinations, 61 routes (57 active, 0 holddown, 4 hidden) 130.130.0.0/...
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BGP unnumbered on P2MP link

I'm wondering what will happen if BGP unnumbered session is configured on a link that has multiple routers on the other side which are both IPv6-capable and will both reply on RS and produce RA ...
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How to block advertisement of a prefixes recieved from 1 BGP neighbor to another

I have a eBGP topology as follows: RTR1 ------ DUT ------ RTR2 (AS100) (AS200) (AS300) I do not want any routes sent by RTR1 to be advertised into RTR2 by DUT I do not know what exactly the ...
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Is it possible to filter directly connected networks redistribute with BGP based on a peer basis?

Assume a simplified case in which router R1 is connected to two BGP peers: one eBGP peer and one iBGP peer. Is there a possibility to advertise directly connected routes only to one of them ...
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Why does Junos find multiple next hops only for the active prefix in case BGP multipath is enabled?

I have a Juniper router named r3 with one established eBGP session to router t1(172.16.0.14) and with second established eBGP session to router t2(172.16.0.18). BGP configuration of r3 can be seen ...
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Cisco N9K - Down an interface in response to another interface going down?

I currently have my transit providers plugged directly into my router. I really like this arrangement because when the ISP goes down this typically downs the interfaces which results in BGP peering ...
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How to redistribute BGP routes learned from AWS in one VR into another BGP running in another VR in Palo Alto firewall?

I have about 1000+ prefixes I am learning from AWS on Palo Alto through a BGP. This is on the secondary VR. Main VR is where my core routing is situated along with another BGP instance pointing to ...
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Make eBGP and iBGP equal in Juniper MX204

Apologize for the dumb question, I come from the server world. Our network admin is on holiday and I'm filling in. For the sake of simplicity, we have a fairly symmetric traffic pattern, what goes up ...
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Show 'all' routes to a given prefix on Juniper Router

Forgive me if I'm not using the correct terminology here but I'm on a Juniper MX204 router, call it router A. I'm receiving full table from my ISP. I do a show route, i.e. show route 1.1.1.1 and I ...
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BGP Authentication Key-Chain Between Cisco IOS XE L3 Switch (c9300-24S) and Juniper MX480 Router

Need to create a BGP authentication keychain between Cisco and Juniper devices. Need assistance with config commands for Cisco 9300-24S.
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Is it possible to withdraw a longer prefix without disrupting service via a shorter prefix announcement?

Using example IPv4 addresses for discussion, assume I have used BGP to announce to the Internet the prefix 192.0.0.0/16 from datacenter A, and I have also announced a longer prefix 192.0.2.0/24 (a ...
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BFD issue with BGP support on Cisco 9396PX

I have following BGP configuration and trying to reduce my convergence time with help of BFD but having hard time. router bgp 1111 log-neighbor-changes address-family ipv4 unicast network 22....
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Use ECMP to distribute traffic between two paths, one learned by eBGP and one learned by iBGP on a Cisco NX-OS switch

I maintain two cross-connected switches, R1 and R2, which both have a link to an external switch, R3. R1 and R2 both use eBGP to receive routes to various subnets behind R3. Additionally, R1 and R2 ...
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BGP - Active\Passive Setup, except one AS

I have two transit providers, A and B. The business has chosen to make provider A more attractive due to billing concerns (we get attractive bulk pricing from this global provider). This was done by ...
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EVPN/VxLAN border-leaf question

I have couple of question in above design where i have typical clos network design and my leafs are configured for Cisco vPC for redendency and anycast gateway and running OSPF for underlay and BGP ...
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394 views

Two Datacenter location with same BGP AS number

Currently we have DC-1 running eBGP with my ISP using AS:1111 and i have prefix 1.1.1.0/24 and using BGP Default route because we have only single ISP. Now we are opening new Datacenter in remote ...
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Can a leaf (mc-lag switch pair) connect to an uplink (spine : a single switch) using lag (not a route-only-port)?

By 'lag', I mean one port from each mc-lag peer connects to a port each on the uplink switch (consider this a single switch spine). The mc-lag is an active-active forwarding pair for L2 traffic (aruba'...
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BGP influence outbound traffic based on prefix

I have two router core1 and core2 connected with ISP router border1 and border2 using eBGP peer and i have 5 public subnect (/24). My ISP sending me default route instead of full BGP table. Question:...
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BGP Community Policy to only allow single Community tagged routes

I have a requirement to do a Cisco IOS-XR Route-policy to allow only routes that have a single community tagged and not allow routes with multiple community tags. I built a lab that has two routes: ...
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Advertising your prefix out of another ASN

We own a few blocks of IP addresses. At several distinct sites we currently advertise our own prefixes on our routers to our upstream transit provider. We are not anycasting. One /24 is originated ...
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Can people with an ISP access your network if it is on the Default Free Zone?

Let's say you have a router on the DFZ (despite costing an absurd ammount of money). Would your network work the same as if you have an ISP in terms of web hosting, etc? Can people still access your ...
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exabgp heathcheck session bgp

I've been trying to use exabgp. I know how to to issue command to the exabgp however i struggle to find whole list of commands the application accepts. With that I can't find a way to receive ...
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Brocade L2VPN Route Reflector

I am trying to create an MPLS VPLS network where the VPLS instances are auto-discovered via BGP L2VPN. The issue I'm currently facing is that the routes are not reflected and there seems to be no ...
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How can I tell which prefixes are being advertised?

Forgive me if this is a dumb question but I'm relatively new to the carrier networking world. We own a block of IP addresses, say a /18 and we advertise various /20s, /24s, /23s, etc all over the ...
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BGP Route Reflector

In the following configuration, INTERNAL1 and INTERNAL4 are RR and INTERNAL2 and INTERNAL3 are clients. I am not able to see the routes 20.1.1.0 and 10.1.1.0 on INTERNAL3 and 30.1.1.0 and 40.1.1.0 on ...
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In Bgp TTL security all control packets will have configured hop value?

Topology: loop(2.1.1.1) - routerA (192.168.1.2)--------- (192.168.1.1) routerB - loop(1.1.1.1) I have eBGP peering configured with a Multihop of 2 on both sides and static routes to reach loopbacks. ...
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isis redistribute bgp not working

I am having trouble getting route redistribution into ISIS working. It works from ISIS to BGP, but I can't get the opposite to show up. I am using IOS-XR Network has 3 routers: A----B----C A and B ...
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Extract upstream/downstream ASNs from BGP table path

I want to extract upstream and downstream ASN for any given ASN, for example: https://www.cidr-report.org/cgi-bin/as-report?as=AS4826&view=2.0 My goal at the end is to generate ASN route graphic ...
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eBGP failover without packet drops

I have core1 and core2 router peer with same ISP but distinct hardware and they are sending us default route. currently all in/out traffic going over to core1 and core2 is idle (standby), I have iBGP ...
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Get ASN Upstreams/Downstreams/Peers

I'm trying to gather the Upstreams/Downstreams/Peers of an ASN. Lets take for example AS8866, I run this query on the ripe API https://stat.ripe.net/data/asn-neighbours/data.json?resource=AS8866 ...
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Routing daemon vs router configuration

Which is the difference between a routing daemon and a router configuration? For example using BIRD you can set up a BPG session, but you can always set up a BGP session for example using a CISCO ...
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Active\Passive Routers w\ BGP

What I'm trying to do is take two routers, "A" and "B" where 'A' is the primary router. Just like with active\passive firewalls and HSRP I want to "float" the default gateway between either Router A ...
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Can BGP-LS provide an ip address as a node attribute when distributing IS-IS

I have an IS-IS network (all cisco) with a BGP router (cisco) that I am using to distribute the network link-state for monitoring / analysis. one thing I would like is to receive an IP address for ...
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Junos: how to change BGP MED for secondary node?

I have vSRX cluster, which announce some protected addresses over IBGP. Each node has two sessions with two routers. (I use ge-0/0/1 and ge-7/0/1 for that). I found that if fail-over happens, and ...

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