Hello Bird Users,
Hope you will be able to help me. I have 8 bgp peers which use the same bgp
template with below import filter:
filter IMPORT__SPINE__TO__LEAF
{
bgp_community.add(LOOP_DETECTION);
gw = bgp_next_hop; -> I use it to set ipv6 bgp next hop to global ipv6
address (not link local)
if (net = 0.0.0.0/0 || net = ::/0) then
{
reject;
}
…
else
{
reject;
}
}
1.First Peer -> this look good
r14.spine101.fra02.fab> bird show protocols all
2a02:26f0:3700:1101::1__r01.leaf101
BIRD 2.0.7 ready.
Name Proto Table State Since Info
2a02:26f0:3700:1101::1__r01.leaf101 BGP --- up 09:58:55.848
Established
…
Channel ipv6
State: UP
Table: master6
Preference: 100
Input filter: IMPORT__SPINE__TO__LEAF
Output filter: EXPORT__SPINE__TO__LEAF
Routes: 27 imported, 4 exported, 25 preferred -> I expect to
import 27 routes
Route change stats: received rejected filtered ignored accepted
Import updates: 27 0 0 0 27
Import withdraws: 0 0 --- 0 0
Export updates: 15846 50 15791 --- 5
Export withdraws: 11 --- --- --- 0
BGP Next hop: 2a02:26f0:3700:1101::
2.Second Peer -> this does not look good:
r14.spine101.fra02.fab> bird show protocols all
2a02:26f0:3700:1102::1__r02.leaf101
BIRD 2.0.7 ready.
Name Proto Table State Since Info
2a02:26f0:3700:1102::1__r02.leaf101 BGP --- up 09:58:56.676
Established
Channel ipv6
State: UP
Table: master6
Preference: 100
Input filter: IMPORT__SPINE__TO__LEAF
Output filter: EXPORT__SPINE__TO__LEAF
Routes: 4 imported, 4 exported, 0 preferred -> bird imports only
4 routes
Route change stats: received rejected filtered ignored accepted
Import updates: 27 0 23
0 4 -> bird reject 23 routes
After I reload this protocol all looks good and bird import 27 routes
In logs I see “Invalid gw address”, therefore I suspect issue with “gw =
bgp_next_hop”
2020-07-22 09:58:56.801 <ERR> filters, line 169: Invalid gw address
2020-07-22 09:58:56.801 <ERR> filters, line 169: Invalid gw address
2020-07-22 09:58:56.801 <ERR> filters, line 169: Invalid gw address
2020-07-22 09:58:56.801 <ERR> filters, line 169: Invalid gw address
2020-07-22 09:58:56.801 <ERR> filters, line 169: Invalid gw address
I am able to reproduce issue on more routers, please find below out from
another router:
r16.spine101.fra02.fab> show bgp summary -> it parse “show protocols all”
IPv6 Peers: 10 Down: 0
Peer AS State (Im/Filt/Exp/Pref)
Up/Down Protocol
2a02:26f0:3700:211:: 20940 Established (8480/0/35/8480)
00:36:46 2a02:26f0:3700:211::__r01.border101
2a02:26f0:3700:311:: 20940 Established (7131/0/34/7)
00:36:48 2a02:26f0:3700:311::__r02.border101
2a02:26f0:3700:1301::1 20940 Established (28/0/4/26)
00:36:51 2a02:26f0:3700:1301::1__r01.leaf101
2a02:26f0:3700:1302::1 20940 Established (4/0/4/0)
00:36:49 2a02:26f0:3700:1302::1__r02.leaf101 -> 4 routes are imported
but should be 28
2a02:26f0:3700:1303::1 20940 Established (28/0/4/1)
00:36:53 2a02:26f0:3700:1303::1__r03.leaf101
2a02:26f0:3700:1304::1 20940 Established (4/0/4/0)
00:36:50 2a02:26f0:3700:1304::1__r04.leaf101
2a02:26f0:3700:1305::1 20940 Established (28/0/4/1)
00:36:47 2a02:26f0:3700:1305::1__r05.leaf101
2a02:26f0:3700:1306::1 20940 Established (28/0/4/1)
00:36:46 2a02:26f0:3700:1306::1__r06.leaf101
2a02:26f0:3700:1307::1 20940 Established (28/0/4/1)
00:36:47 2a02:26f0:3700:1307::1__r07.leaf101
2a02:26f0:3700:1308::1 20940 Established (28/0/4/1)
00:36:46 2a02:26f0:3700:1308::1__r08.leaf101
After protocol reload all looks good.
Did you face similar problem?
Regards,
Dariusz
