Jean-Francois, Comments in line.
On Fri, Aug 2, 2024, 22:59 Jean-Francois Mezei <jfmezei_na...@vaxination.ca> wrote: > On 2024-08-02 21:39, Jean-Francois Mezei wrote: > > > Following process, redacted portions of the XONA Partners report have > > been published. > > > > https://crtc.gc.ca/otf/eng/2022/8000/c12-202203868.htm > > > I have some question on terminology: (pardon my newbieness, just wanting > to be pedantic on terminology). > > > > "Rogers staff removed the Access Control List policy filter from the > configuration of the distribution routers. This consequently resulted in > a flood of IP routing information into the core network routers, which > triggered the outage." > > The report mentions Rogers uses IS-IS as interior routing protocol buit > i'll use the more generic OSPF bellow. > > > Assumtion here is that only IS-IS or OSPF is used. In a dual stack > network, its possible both are used - one for each protocol family . > Questions: > > 1- I had always heard of routers facing the Internet (and thus doing > BGP) as "edge" or "border". Is the term "distribution router" common > in the industry > The term was common 20+ years ago. Core / distribution / access - being common legacy terms. > 2- When a border/edge router receives some 980,000 route entries from > the transit provider, aren't those packets addressed to the IP address > of that edge router with port 179 and going to the router's internal BGP > process instead of being routed? (report makes it look those packets > were left to run wild and propagate onto the intranet due to lack of ACL). > > Internet edge is not the only edge in complex operator networks. Often > services are colorated in central areas if a network. These area may not > be eBGP but rather iBGP. > > > > Would the rules that define which BGP routes are to be converted to OSPF > and then propagated to OSPF peers on the intranet be called an "Access > Control List"? If not, what would they be called? (routing policy filter?) > > > No. Doubt anyone actually exports bgp to igp anymore. ACLs are often used > for route policy. > > > > (I have always though of ACL as a packet routing rule, not of route > building one). > > Would it be fair to state that a large ISP network would use BGP to OSPF > route propagation to load balance upload-heavy site? BGP1 advertises > itself to OSPF-A B and C as the router to talk to for packets desined to > upload-heavy site, while BGP2 does the same for internal routers OSPF-D > E and F? > > (Just trying to understand the scope of route information that Rogers's > BGP routers would want to send to the internal routing protocol. > > > In short. The way the report was written, you will not be able to > decipher what actually happened. > > > Thanks in advance for any precisions on the above. Just want to make > sure I puch right when I make requests for disclosure of the redacted > portions. > Victor K > >
