Mailing List Archive

Hi everyone,

we have a dual-homed connection to one ISP and are using
quagga-1.0.20160309 on freebsd 10.3.

We have started to implement ipv6 in our network. Right now we have an
severe issue with iBGP route advertising the routes of the ipv6 networks
on our customer routers.

We have setup a test environment with four virtual routers (using "BSDRP
1.60 https://bsdrp.net/) and see there the same behavior.
However if we install quagga 0.99.24.1 in this test setup, the iBGP
routes are advertised as expected.

Here some details:

IP of ISP router 1: 2001:db8:100:10::1
IP of ISP router 2: 2001:db8:100:20::1
IP of customer router 1: 2001:db8:1cc:111::1
IP of customer router 2: 2001:db8:1cc:222::1

If both customer routers run quagga 0.99.24.1 <http://0.99.24.1>:
Routes received from router 1 and advertised by router 2:

R-customer-2# sho ipv6 bgp neighbors 2001:db8:1cc:111::1 advertised-routes
BGP table version is 0, local router ID is 192.168.255.2
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
*> ::/0 2001:db8:100:20::1
0 100 0 65100 i
*> 2001:db8:1cc::/64
2001:db8:1cc:222::1
0 100 32768 i
*> 2001:db8:1cc:3::/64
2001:db8:1cc:222::1
0 100 32768 i
Total number of prefixes 3

R-customer-2# sho ipv6 bgp neighbors 2001:db8:1cc:111::1 routes
BGP table version is 0, local router ID is 192.168.255.2
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
* i::/0 2001:db8:100:10::1
0 100 0 65100 i
* i2001:db8:1cc::/64
2001:db8:1cc:111::1
0 100 0 i
* i2001:db8:1cc:3::/64
2001:db8:1cc:111::1
0 100 0 i
-------------------------------------------------------------------

Now running quagga 1.1.0_1 on R-customer-2 most of the times this routers stops
advertising some routes. Sometimes only the default route is missing, sometimes
no routes are advertised, sometimes all routes are present.

Reseting the BGP session between the two customer routes doesn't seems to have
an influence to the route advertisement, however reseting the BGP session with
the router of the ISP has an effect on the routing advertisement.

Here are two examples which routes are advertised:

--> no route at all:
R-Kunde-2# show ipv6 bgp neighbors 2001:db8:1cc:111::1 advertised-routes
BGP table version is 0, local router ID is 192.168.255.2
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
R-Kunde-2#

--> default route missing:
R-Kunde-2# show ipv6 bgp neighbors 2001:db8:1cc:111::1 advertised-routes
BGP table version is 0, local router ID is 192.168.255.2
Status codes: s suppressed, d damped, h history, * valid, > best, = multipath,
i internal, r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path
*> 2001:db8:1cc::/64
2001:db8:1cc:222::1
0 100 32768 i
*> 2001:db8:1cc:3::/64
2001:db8:1cc:222::1
0 100 32768 i

Total number of prefixes 2
R-Kunde-2#
-------------------------------------------------------------------

If we run quagga 1.1.0_1 on both customer routers the "failure rate in
route advertisement" seems to be "higher".

Anyone any idea? Can someone confirm this behavior? (We will probably switch back
to quagga 0.99.24.1 in our productive environment in this week.)

Best regards
Thomas Hilse