From: Daniel Ginsburg (dginsburg@mail.ru)
Date: Mon Aug 09 2004 - 06:48:18 GMT-3
The Internetworkexpert solutions guide mentions that "IS-IS level-1 can
run over logical partial mech as long as the DIS has a direct layer 2
circuit to all devices on the NBMA segment." [1]
I couldn't get such setup working. The configuration is pretty simple:
R1 is a hub, R2 and R3 are spokes.
Relevant configurations excerpts follow.
R1:
interface Loopback0
ip address 10.0.0.1 255.255.255.255
!
interface Serial0/0
ip address 192.168.0.1 255.255.255.0
ip router isis
encapsulation frame-relay
no arp frame-relay
isis priority 127
frame-relay map clns 103 broadcast
frame-relay map clns 102 broadcast
frame-relay map ip 192.168.0.2 102 broadcast
frame-relay map ip 192.168.0.3 103 broadcast
no frame-relay inverse-arp
!
router isis
net 49.0001.0000.0000.0001.00
is-type level-1
passive-interface Loopback0
!
R2:
interface Loopback0
ip address 10.0.0.2 255.255.255.255
!
interface Serial0/0
ip address 192.168.0.2 255.255.255.0
ip router isis
encapsulation frame-relay
no arp frame-relay
isis priority 0
frame-relay map clns 201 broadcast
frame-relay map ip 192.168.0.1 201 broadcast
frame-relay map ip 192.168.0.2 201
frame-relay map ip 192.168.0.3 201
no frame-relay inverse-arp
frame-relay lmi-type cisco
!
router isis
net 49.0001.0000.0000.0002.00
is-type level-1
passive-interface Loopback0
!
R3:
interface Loopback0
ip address 10.0.0.3 255.255.255.255
!
interface Serial0/0
ip address 192.168.0.3 255.255.255.0
ip router isis
encapsulation frame-relay
no arp frame-relay
isis priority 0
frame-relay map clns 301 broadcast
frame-relay map ip 192.168.0.1 301 broadcast
frame-relay map ip 192.168.0.2 301
frame-relay map ip 192.168.0.3 301
no frame-relay inverse-arp
router isis
net 49.0001.0000.0000.0003.00
is-type level-1
passive-interface Loopback0
!
Adjacencies are fine, LS databases of all three routers are syncronized
but R2 is missing R3's lo0 route and R3 is missing R2's loopback either.
As far as I understand this is how it is supposed to be, but IE solutions
guide claims otherwise. Am I missing something?
Output of few show commands from R3 follows.
r3#sh ip ro
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
10.0.0.0/32 is subnetted, 2 subnets
C 10.0.0.3 is directly connected, Loopback0
i L1 10.0.0.1 [115/10] via 192.168.0.1, Serial0/0
C 192.168.0.0/24 is directly connected, Serial0/0
r3#sh isi da
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
r1.00-00 0x00000008 0x8754 537 0/0/0
r1.01-00 0x00000004 0x952C 629 0/0/0
r2.00-00 0x00000008 0xCB0C 480 0/0/0
r3.00-00 * 0x00000009 0x0EC4 566 0/0/0
r3#sh isi da de
IS-IS Level-1 Link State Database:
LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
r1.00-00 0x00000008 0x8754 501 0/0/0
Area Address: 49.0001
NLPID: 0xCC
Hostname: r1
IP Address: 10.0.0.1
Metric: 10 IP 192.168.0.0 255.255.255.0
Metric: 0 IP 10.0.0.1 255.255.255.255
Metric: 10 IS r1.01
r1.01-00 0x00000004 0x952C 592 0/0/0
Metric: 0 IS r1.00
Metric: 0 IS r3.00
Metric: 0 IS r2.00
r2.00-00 0x00000009 0xC90D 1165 0/0/0
Area Address: 49.0001
NLPID: 0xCC
Hostname: r2
IP Address: 10.0.0.2
Metric: 10 IP 192.168.0.0 255.255.255.0
Metric: 0 IP 10.0.0.2 255.255.255.255
Metric: 10 IS r1.01
r3.00-00 * 0x00000009 0x0EC4 515 0/0/0
Area Address: 49.0001
NLPID: 0xCC
Hostname: r3
IP Address: 10.0.0.3
Metric: 10 IP 192.168.0.0 255.255.255.0
Metric: 0 IP 10.0.0.3 255.255.255.255
Metric: 10 IS r1.01
r3#sh isi to
IS-IS IP paths to level-1 routers
System Id Metric Next-Hop Interface SNPA
r1 10 r1 Se0/0 DLCI 301
r2 10
r3 --
r3#sh cln ne de
System Id Interface SNPA State Holdtime Type Protocol
r1 Se0/0 DLCI 301 Up 7 L1 IS-IS
Area Address(es): 49.0001
IP Address(es): 192.168.0.1*
Uptime: 00:39:23
NSF capable
[1] IE solutions guide, page 645
-- dg
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