Dotaz: OSPF - rozpada se spojeni

[Zdeněk Štěpánek]

Zdravim

V cele siti pres 15 routeru pouzivam Quaggu - OSPF. Skoro bych rekl ze to co od toho potrebuju zvladnu levou zadni, az ted.

Nainstalovali jsme novz 5Ghz spoj, ten je sam o sobe bezchybny. Na obou koncich jsem nastavil ospfd.conf:

interface ath1 description PTP_PR_ME ip ospf cost 500 ip ospf dead-interval 240 ip ospf retransmit-interval 4

!5g-prazska-melnik network 10.193.120.112/30 area 0

Na obou koncich je nastaveni identicke.

Router prazska je centrum, je tam nekolik spoju a melnik je jen okrajove AP bez dalsich spoju.

Verze quaggy i systemu je identicka na obou routerech, dokonce je to i stejny hardware. Lety overena kombinace.

Chovani je takove, ze spoj se vetsinou nahodi, ted treba jel vic nez den, ale ted uz se zase spojeni rozpadlo.

Aktualni chovani je tohle:

64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=44 ttl=62 time=53.8 ms
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=45 ttl=62 time=3.10 ms
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=46 ttl=62 time=14.0 ms
From router-prazska.gavanet.czf (10.193.121.97) icmp_seq=48 Time to live exceeded
From router-prazska.gavanet.czf (10.193.121.97) icmp_seq=50 Time to live exceeded
From router-prazska.gavanet.czf (10.193.121.97) icmp_seq=52 Time to live exceeded
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=53 ttl=62 time=16.5 ms
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=54 ttl=62 time=3.22 ms
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=55 ttl=62 time=3.00 ms
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=56 ttl=62 time=4.32 ms
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=57 ttl=62 time=2.60 ms
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=58 ttl=62 time=3.34 ms
From router-prazska.gavanet.czf (10.193.121.97) icmp_seq=59 Time to live exceeded
From router-prazska.gavanet.czf (10.193.121.97) icmp_seq=60 Time to live exceeded
From router-prazska.gavanet.czf (10.193.121.97) icmp_seq=61 Time to live exceeded
From router-prazska.gavanet.czf (10.193.121.97) icmp_seq=62 Time to live exceeded
From router-prazska.gavanet.czf (10.193.121.97) icmp_seq=63 Time to live exceeded
From router-prazska.gavanet.czf (10.193.121.97) icmp_seq=64 Time to live exceeded
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=65 ttl=62 time=17.0 ms
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=66 ttl=62 time=2.68 ms
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=67 ttl=62 time=2.51 ms
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=68 ttl=62 time=2.59 ms
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=69 ttl=62 time=2.73 ms
64 bytes from router-melnik.gavanet.czf (10.193.123.15): icmp_seq=70 ttl=62 time=3.27 ms
From router-prazska.gavanet.czf (10.193.121.97) icmp_seq=71 Time to live exceeded
From router-prazska.gavanet.czf (10.193.121.97) icmp_seq=72 Time to live exceeded
From router-prazska.gavanet.czf (10.193.121.97) icmp_seq=73 Time to live exceeded

OSPF pakety na oba konce prichazeji v pravidelnych intervalech (10 sec) a bez prestani resetuji dead-interval (4 min).

telnet localhost ospfd ... router-prazska> s i o n

Neighbor ID     Pri   State           Dead Time   Address         Interface           RXmtL RqstL DBsmL
10.193.123.13     1   Full/Backup     00:03:56    10.193.120.113  ath0:10.193.120.114     0     0     0

router-melnik> s i o n

Neighbor ID     Pri   State           Dead Time   Address         Interface           RXmtL RqstL DBsmL
10.193.123.9      1   Full/DR         00:03:53    10.193.122.90   ath0:10.193.122.89     0     0     0
10.193.123.15     1   Full/DR         00:03:53    10.193.120.114  ath1:10.193.120.113     0     0     0
10.193.123.4      1   Full/DR         00:00:33    10.193.120.36   eth1:10.193.120.37     0     0     0
10.193.123.14     1   Full/DR         00:03:53    10.193.120.92   eth2:10.193.120.89     0     0     0
10.193.123.10     1   Full/DR         00:00:33    10.193.122.81   eth4:10.193.122.84     0     0     0

Na melniku zebra i ospfd bezi, staticke routy zapsane v zebra.conf se na routeru vytvori, ale z prazske nic.

Zvlastni je, ze na routeru melnik routy smer prazska jsou vzdy, ale na prazske vypadavaji.

root@router-prazska:~# route | grep ath1
10.193.120.112  *               255.255.255.252 U     0      0        0 ath1

Muzete mi nekdo poradit co jeste muzu zkusit?

Na zaver se omlouvam, jestli jsou ty vypisy moc siroky, na 800x600 se to tezko pozna.

Diky

Zdenek

Odpovědi

[bogas]

Zdravim

ve chvili kdy ti to nastane, tak se telnetni na quaggu a pohraj si s prikazem debug.

PS: takovahle situace nastava na nekterych 5GHz minipci kartach Atheros v kombinaci s madwifi. Spojeni(ospf) nabehne a treba po 12ti hodinach se rozpoji a pomuze az treba druhy restart quaggy. Zkus na interfacu pouzit specifikaci, ze se jedna o NBMA sit a nastav neighbory na obou stranech. Madwifi ma totiz nekdy (dost nahodne) problem s posilanim multicastu, kterej ospf pouziva pro zjistovani neighboru.

[m$ lipo $m]

nemas nekde stejny router-id ?

[Zdeněk Štěpánek]

Zdravim

Dik za radu. Router-id stejny nemam, to uz me parkrat proskolilo. Ten system byl doted pripojeny na router parzska (ten hlavni) pres vsesmerovku na 2.4. Ted jsme jen nainstalovali 5Ghz a vymenili pocitac, aby videl 5Ghz karty.

Jsou to WX-760A s atherosem, muzu zkusit definovat sousedy. Na stejnych kartach (jen jiny OEM logo) uz jeden spoj mam a bez sebemensich problemu.

Jinak od napsani dotazu uz to zase jede, asi se me leknul.

Zdenek