Another experiment: I've turned off the BGP session with my uplink peer
in my VPP router (I was running with the iBGP session turned off to
avoid problems). After that, obviously Bird has no more routes, and
neither does the kernel (other than the device routes):
# birdc show route
BIRD 2.16.1 ready.
#
# ip r|grep -v "scope link"
#
However VPP still has a lot of routes:
# vppctl show ip fib|grep "via x.y.z.w"|wc -l
575106
Trying to remove these routes manually doesn't work either:
# vppctl ip route del 1.0.168.0/24
# vppctl show ip fib 1.0.168.0/24
ipv4-VRF:0, fib_index:0, flow hash:[src dst sport dport proto flowlabel
] epoch:0 flags:none locks:[adjacency:1, default-route:1, lcp-rt:1, ]
1.0.168.0/24 fib:0 index:345621 locks:2
lcp-rt-dynamic refs:1 src-flags:added,contributing,active,
path-list:[77] locks:1150210 flags:shared,popular, uPRF-list:70
len:1 itfs:[3, ]
path:[103] pl-index:77 ip4 weight=1 pref=32 attached-nexthop:
oper-flags:resolved,
x.y.z.w uplink1
[@0]: ipv4 via x.y.z.w uplink1: mtu:1500 next:5 flags:[]
b49691b2a989b49691b2a6200800
forwarding: unicast-ip4-chain
[@0]: dpo-load-balance: [proto:ip4 index:345622 buckets:1 uRPF:70
to:[0:0]]
[0] [@5]: ipv4 via x.y.z.w uplink1: mtu:1500 next:5 flags:[]
b49691b2a989b49691b2a6200800
ipv4-VRF:180, fib_index:1, flow hash:[src dst sport dport proto
flowlabel ] epoch:0 flags:none locks:[recursive-resolution:1, lcp-rt:1, ]
0.0.0.0/0 fib:1 index:47 locks:2
default-route refs:1 entry-flags:drop,
src-flags:added,contributing,active,
path-list:[64] locks:2 flags:drop, uPRF-list:60 len:0 itfs:[]
path:[90] pl-index:64 ip4 weight=1 pref=0 special:
cfg-flags:drop,
[@0]: dpo-drop ip4
forwarding: unicast-ip4-chain
[@0]: dpo-load-balance: [proto:ip4 index:48 buckets:1 uRPF:60
to:[3736:194742]]
[0] [@0]: dpo-drop ip4
In this state, I've tried the test 'ip route add'/'ip route replace'
proposed earlier, and that test still works, so the problem only seems
to affect routes learned via BGP. I'm not sure if the problem is the
protocol itself or if the high number of route modifications is causing
VPP to miss those netlink messages.
Best,
Andre
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