RARE user and assistance email list

[mc36 <>]

hi,
you're unbelivebeable! you built up a whole topology alone, without asking a 
question! congrats!
here is my findings after checking out the r4-r44 connection... i enabled cdp 
on the interface:

R44#show cdp neighbor
interface  hostname  iface      ipv4  ipv6
ethernet1  R4        ethernet3  null  null

R44#

R4#show cdp neighbor
interface  hostname  iface  ipv4  ipv6

R4#

but it indicates a one-way connection....

R4#show interfaces ethernet3
ethernet3 is up
 description:
 state changed 3 times, last at 2023-01-04 20:42:07, 00:10:46 ago
 last packet input never ago, output 00:00:00 ago, drop never ago
 type is ethernet, hwaddr=0000.4444.0005, mtu=1500, bw=100mbps
 received 0 packets (0 bytes) dropped 0 packets (0 bytes)
 transmitted 1817 packets (103734 bytes) macsec=false sgt=false

R4#

on r4 i cannot see received packets... on r44 i have both rx and tx:

R44#show interfaces ethernet1
ethernet1 is up
 description:
 state changed 3 times, last at 2023-01-04 20:42:07, 00:12:10 ago
 last packet input 00:00:00 ago, output 00:00:00 ago, drop 00:00:00 ago
 type is ethernet, hwaddr=0000.8888.0001, mtu=1500, bw=100mbps
 received 6069 packets (363198 bytes) dropped 1982 packets (112310 bytes)
 transmitted 4088 packets (246816 bytes) macsec=false sgt=false

R44#

then grepping around for 46025 showed me that you reused this port for both 
r4-r44 and r3-r33 connection!
so you had a competition, one or the other was able to use the interface and 
communicate... :)
br,
cs




On 1/4/23 21:26, Maria Del Carmen Misa Moreira wrote:
> Hi Csaba,
>
> I attach here all the hw and sw files that I   m using for the simulation with topology.png and readme.txt files for clarification and start_topology.sh to load and start all the 
> routers.
>
> All the boxes are using Freertr and the log at the beginning is fine without 
> errors:
>
> info cfgInit.doInit:cfgInit.java:775 booting
> info cfgInit.doInit:cfgInit.java:957 initializing hardware
> info cfgInit.doInit:cfgInit.java:963 applying defaults
> info cfgInit.doInit:cfgInit.java:984 applying configuration
> info cfgInit.doInit:cfgInit.java:1019 boot completed
>
> Tomorrow I will be able from 8h until 17h or later if it   s needed.
>
> Cheeers,
> Carmen Misa
>
>
>
> > El 4 ene 2023, a las 13:24, mc36 <> escribi  :
> >
> > hi,
> > so bgp peer establishment is somewhat random: the original rfc does not 
> > mention that the higher/lower ip should initiate the tcp
> > so i'm copying the ios xr behavior: it tries active then passive open with 
> > random timers and fingers crossed, it'll come up...
> > all my interop with cisco xr, cisco xe, junos, frr and self tests (about 800 
> > bgp tests in total) pass fine without a single
> > retry so it cannot be that bad.. the only issue i know about is with bird in 
> > my dn42 peerings, which does wildcard listen on
> > port 179, causing every active open to succeed, but sometimes it's 
> > simultaneous with their active open resulting in collisions
> > at the bird side.. then their side closes one or the other without a notify 
> > message causing log flood on freerouter side
> > until the session finally comes up...
> > in your topology, i've a lot of questions:
> > -what is that (as10, as20, as30) notation? the common way is that one box 
> > belongs to one asn?
> > -what box is freerouter and what the other boxes are?
> > -do you see anything in the freerouter and the opposite box's logs?
> > -can you share the simulation in order to be able to reproduce?
> > -if not, can we have a debug session together?
> > thanks,
> > cs
> >
> >
> > On 1/4/23 12:24, Maria Del Carmen Misa Moreira wrote:
> > > Hi,
> > > I have a full mesh topology RX configured with iBGP, OSPF, 3 VLANs and 3 VRFs 
> > > (BGP is configured with the address of the loopbacks: 1 loopback per VLAN). 
> > > Every router has a client RXX with OSPF passive, eBGP, a different AS number 
> > > and 1 VRF.
> > > (AS100)     R11 ---- (AS10, AS20, AS30) R1 ---- (AS10, AS20, AS30)R4 ---- 
> > > (AS400) R44
> > > *|*|**
> > > (AS200) R22 ---- (AS10, AS20, AS30) R2 ---- (AS10, AS20, AS30) R3 ----(AS300) 
> > > R33
> > > The topology is working fine so I can ping each other, iBGP is up but eBGP is not completly up. I noted that R11 and R22 are always up but for R33 and R44 it depends... This is the behaviour that I'm seeing: I run the simulation and R11/R22 bring up and  also R33 (not R44), then, I run again the simulation with exactly the same configuration and sometimes it happens that R44 brings up and not R33 or even worst none of them (R33, 
> R44).
> > > Any idea? I have no idea why only one of those (R33, R44) brings up and not 
> > > the other and when you run it again it be opposite behaviour.
> > > Cheers,
> > > Camen Misa