Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [bgp]

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

2
votes
2answers
81 views

No route to host for IPs in same subnet being routed by bgp

I have set up BGP to do some custom routing for a subset of addresses in the range 192.168.1.0/24. I have verified that the BGP is working by testing ping/curl on a different host in a different ...
2
votes
2answers
76 views

Running iBGP without IGP

Given following setup: Configuration of the routers is very straight forward. Router BGP1: interface Loopback0 ip address 1.1.1.1 255.255.255.255 ! interface Loopback9 ip address 9.9.9.9 255.255....
1
vote
1answer
37 views

VPLS how to signal CE facing interface failure

Hello, I have a BGP-based VPLS setup with one CE machine being multi-homed multi-homing works if i for example shut the active PE or i somehow disturb the connection between my PEs... that ok but ...
0
votes
0answers
20 views

How to force client side HSRP interface to go into standby when internet is not reachable [duplicate]

I have a VIRL setup in which the client router is connected to a client switch that connected to two provider switches that have HSRP configured for the client gateway. The two switches are in an OSPF ...
2
votes
1answer
31 views

H-VPLS application with different types of VPLS

so ive been digging around VPLS for a while and i have come across a term H-VPLS. My knowledge is: VPLS can be signalled using LDP (manual or autodiscovery) or BGP (autodiscovery). H-VPLS: ...
0
votes
1answer
59 views

How to change AD on Juniper router?

I have this route on my Juniper Router and some destinations have two routes: OSPF and BGP. I want to change the administrative distance for the BGP route so that it will be smaller than the OSPF ...
1
vote
1answer
68 views

How to explain that a route has two different AS numbers?

I have a question about the AS path, see the below example where I show the route 114.114.114.114. This shows several BGP routes. See the fist route item. The AS path is 4809 4134 I, I want to know ...
0
votes
1answer
50 views

Can not use `update-source` in bgp neighbor command in Cisco Packet Tracer

In my Cisco Packet Tracer, I have a ISR4321 router: Router1(config-router)#neighbor 12.0.0.2 update-source lo0 ^ % Invalid input detected at '^' marker. I ...
0
votes
1answer
63 views

What's the meaning of `State` and `PfxRcd`?

When I execute the show ip bgp summary, I get the bellow data: Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 12.0.0.2 4 200 199 190 12 0 ...
1
vote
1answer
275 views

What's the commands of Cisco query bgp neighbor table, bgp table and router table?

In the AS router, I want to query its bgp neighbor table, bgp table, and router table. what's the commands of them?
4
votes
3answers
293 views

Why the last AS PATH item always is `I` or `?`? [duplicate]

you see my snapshot from m Juniper Router, I want to find the routes of 114.114.114.114, but there always get Idle or a ?, why:
5
votes
3answers
78 views

Why do all the intermediary routers need to run iBGP without tunneling?

I'm trying to understand the configuration behind iBGP - I understand you can run full mesh to prevent loops, run confederation or route reflectors, if you don't want full mesh, else run tunneling ...
4
votes
1answer
168 views

What does “Allow AS in” do in BGP?

When configure BGP in a SDN product, i saw there is an option to enable "Allow as in", could anyone know what is it!
0
votes
0answers
36 views

What's the meaning of `%BGP-3-NOTIFICATION: sent to neighbor 12.0.0.1 6/0 (unsupported) 0 bytes `?

In my Router's loopback interface, I configure the following IP address: Router2(config-if)#ip address 2.0.3.2 255.255.255.255 Router2(config-if)# %BGP-3-NOTIFICATION: sent to neighbor 12.0.0.1 6/0 (...
0
votes
1answer
45 views

My BGP router does not advertise configured prefixes

I have two Routers, which are Router1(BGP 100) and Router2(BGP 200), they have set up BGP neighbor for each other: this is my Router1's BGP configuration: ! router bgp 100 bgp log-neighbor-changes ...
0
votes
1answer
45 views

Why Cisco BGP neighbor command need the remote-as number?

When I in my Router2 add a neighbor, the bellow is my command: Router2(config-router)#neighbor 12.0.0.1 remote-as 100 you see, I need write two params, one is neighbor address, and the other is its ...
3
votes
1answer
113 views

Advertise all static route except the default gateway with Juniper SRX firewall

With the following policy, all static routes are advertised via BGP to my neighbor: root@Nitrogen# show policy-options policy-statement bgp-export-policy { term export-statics { from ...
0
votes
1answer
34 views

Cisco create BGP connection, do we need two direction's neighbor command?

I have two routers like bellow: in the Router1, I configured like bellow: ! router bgp 100 bgp log-neighbor-changes no synchronization neighbor 12.0.0.2 remote-as 200 network 1.0.0.0 mask 255....
2
votes
3answers
94 views

Why can the BGP protocol be implemented across routers, but the OSPF protocol can only be implemented direct connected routers?

Why can the BGP protocol be implemented across routers? But the OSPF protocol can only be implemented on directly connected routers? Is the OSPF protocol based on IP? we know the BGP is based on ...
2
votes
1answer
29 views

Juniper router how to check the BGP process port?

Juniper router how to check the BGP process port? If I have a router with IP address 12.12.21.1, we know it run a BGP process, which use TCP 179 port as default. How can I check if port 179 is ...
3
votes
2answers
193 views

How to understand the output below from BGP?

I don't understand some data of the show route: admin@MX-RE0# run show route 36.250.236.6 inet.0: 736608 destinations, 806660 routes (736608 active, 0 holddown, 7 hidden) + = Active Route, - = Last ...
6
votes
1answer
274 views

Can non-recursive BGP route be used to determine next-hop for recursive BGP route?

In BGP recursive scenario, the recursive route is taking an unexpected next-hop. Here is the routing table: S* 0.0.0.0/0 [10/0] via 10.10.10.1, wan B 172.16.5.0/24 [20/0] via 172.80.80.1, MPLS, ...
0
votes
0answers
27 views

How to properly setup graceful-shutdown community

I'm trying to setup graceful-shutdown community but it looks I cannot make it working. community-set comm-graceful-shutdown 65535:0 end-set ! route-policy SOMEIX-IN ! tried set local-preference 0 ...
1
vote
1answer
138 views

Can two networks with the same subnet be connected to the same router in different VRF?

Let's say I have the following four networks: Network A: 10.0.1.0/24 Network B: 10.0.0.0/24 Network C: 10.0.1.0/24 Network D: 10.0.0.0/24 I would like to connect networks A and B together, and do ...
6
votes
3answers
2k views

Can I announce prefix 161.117.25.0/24 even though I don't have all of /24 IPs?

I'm managing one BGP router, under the router I'm trying to announce the following IP prefix:161.117.25.0/24. But the problem is that some of the IP addresses were borrowed by other AS(Autonomous ...
0
votes
1answer
26 views

Why does my route-map blackhole some equally specific routes? [closed]

I have a challenging situation. I have two routers, in VIRL, sharing routes via BGP and OSPF I am attempting to remove the "network 0.0.0.0 255.255.255.255 area 0" from my OSPF process. I have tried ...
0
votes
1answer
57 views

Connecting eBGP and iBGP routers in Quagga

I am trying to run intra and inter-domain routing using Quagga. I like to announce a prefix from AS7 and I like AS6 receive it and send it to AS2(as shown in the attached topology). I know for intra ...
0
votes
1answer
20 views

local pref question

i have a cisco router with 6 bgp peers, 4 bgp peers is from out ip transit's and i am receiving full routing (bgp) table from them. 2 bgp session is over GRE tunnel. and i am receiving 1.1.1.0/24 and ...
4
votes
1answer
113 views

How long the EBGP peer convergence time

We are using Anycast, and I plan to implement the "nearest access" by appending myself AS path to impact my peer BGP routers. For example I have two POPs(they are same ip), Pop1 in London and POP2 ...
0
votes
0answers
36 views

Understanding RIB and Update data from RouteViews

Can someone walk me through some RIB data from RouteViews? I'm having trouble understanding how to make sense of it. The main thing I need to figure out is what part of the RIB entry can be used to ...
2
votes
1answer
37 views

Explanation of repeated ASN in an AS path from a RouteViews file

From the RouteViews RIB files, I was looking at the snapshot from Nov 06, 2017 at 18:00 UTC. This has to do with this BGP routing misconfiguration -- https://dyn.com/blog/widespread-impact-caused-by-...
4
votes
2answers
77 views

Juniper SR300 maximum BGP routes

I've got a Juniper SRX300 which i'm using to connect to 2 BGP peers. The documentation i've read says this SRX only supports 300,000 BGP routes, so for each peer I created an import policy (based on ...
4
votes
2answers
173 views

VXLAN / EVPN Types

Looking into EVPN and the route types (type 2 and 5) is my understanding correct. In terms of their placement into the relevant forward tables upon the device. EVPN Route Type 2: MAC/IP Advertisement ...
3
votes
2answers
63 views

JunOS Use iBGP route over OSPF route

Hello i have an issue where my Juniper router doesnt advertise BGP 10.255.255.4/32 to a neighbor because in inet.0 it is not issued as the best route root# run show route table inet.0 inet.0: 11 ...
0
votes
1answer
37 views

how to change a BGP path in juniper?

How to change the selected BGP route? I show the route 43.242.33.39, there shows 3 GBP paths. but I can not ping the ip(43.242.33.39). and can not traceroute it. how can I do with this?
5
votes
1answer
117 views

BGP - Advertise VRF routes

I have a router with a Global Routing Table (GRT), and a VRF. My end goal is to advertise to my eBGP neighbor my VRF routes. I have actually successfully done it by using address-families (ipv4, ...
3
votes
1answer
146 views

EVPN/VXLAN Flood and Learn

With the original VXLAN spec (RFC) there was no control plane. But Flood and Learn was used via either IR or multicast head-end replication. EVPN was then introduced as the control plane. My ...
1
vote
1answer
162 views

BGP Juniper not reflecting to Cisco?

I am really new to working with Junipers and I am struggling a bit with Route Reflector configuration. I have 3 routers Cisco-Juniper-Juniper2 here is my config: Cisco: router bgp 100 neighbor ...
0
votes
1answer
43 views

Regarding ECMP hashing

Assume we have a following topology. R1 represents Router1, R2 represents Router2, R3 represents Router3 and R4 represents Router4. Src represents the source Server. Dest represents the destination. ...
0
votes
1answer
60 views

Propagating 'trash' ASN, what happens?

This sounds crazy, but I'm analyzing the raw RIS BGP announcement dataset and I spot this announcement: BGP4MP|1543859911|A|198.32.125.181|51185|52.94.20.0/24|51185 9304 1161216244|INCOMPLETE|198....
3
votes
0answers
41 views

How do you specify BGP Authentication Key when using Verizon's Secure Cloud Interconnect?

I am trying to establish a Direct Connect Link using Verizon's Secure Cloud Interconnect service. I have established the connection in the Dynamic Network Manager on the Verizon side and the VIFs ...
0
votes
1answer
122 views

In one organization having two ISP which configured on fortigate firewall ? How can we do the failover for internet?

Organisation don't have AS number .As of now we are doing manually route for any ISP at a time. when default Internet link is go down that time making second link enable on firewall. I saw the some ...
2
votes
3answers
75 views

How is traffic forwarded though IXPs if route servers do not forward any traffic

while i was studying about IXP route-servers, i read that they do not forward any traffic. I get that a route server is a "control plane" entity and it is used for easier bgp peering. However, i ...
2
votes
1answer
67 views

Setting local preference in BGP

I am trying to set the local preference for this configuration To make a route from R1 to R4 via R3. That's how i configure R3 R3#conf term Enter configuration commands, one per line. End with ...
0
votes
1answer
168 views

Download Internet Routing Table

What is the best way to download a snapshot of the Internet's IPv4 routing table? I need check if IP addresses are routable. It needs to function offline, so a looking glass server won't work. I know ...
0
votes
1answer
106 views

Bad mask for loopback interface

I am trying to implement BGP session. I was given this table. When I try to configure loopbacks the first loopback works in the proper way R1(config)#interface loopback 0 R1(config-if)#ip *Mar 1 ...
2
votes
1answer
35 views

JunOS iBGP and return paths odd behaviour

I've got a somewhat basic iBGP configuration with a routing instance "global" between two Juniper vSRX's - each Juniper vSRX has an uplink of its own from a different transit provider with a default ...
1
vote
2answers
78 views

Gather the BGP data by using TCP connection on port 179

In order to gather the information shared between BGP peers, what port number should be used to connect using TCP (I am using 179, and don't see the connection being established)? Will I be able to ...
3
votes
1answer
129 views

Use case for two BGP ASNs?

I’m new to BGP and have a relatively simple question, or so I think it is for you BGP veterans. I would like to build two new seperate edge networks at my company; one for production services and ...
1
vote
1answer
30 views

All routes about a IP in my Router AS-PATH last AS number is Idle

I can not ping the IP 202.137.151.185 from my router. and in my router I show a IP's route, there gets the following information: admin@EE-MX-RE1# run show route 202.137.151.185 ...