ISIS between ( IOS-XE and IOS-XR) peer not establish

[Tareq Emad Al Asfoor]

Hi all , 

I have two router ( IOS-XE ( cisco 3850)  and IOS-XR ( ASR9K ) , These two router connected and i have VLAN1000 peering between them using OSPF ..  Now i need to use the same VLAN to enable ISIS with tag mpls between them.. I configured the two side as you can see below but i cant have neighbor between them , 

IOS-XE

router isis mpls
net 11.1111.1111.1111.1921.6820.5005.00
is-type level-2-only
metric-style wide level-2

!

interface Vlan1000
description To -ASR9K
ip address 10.10.10.1 255.255.255.252
ip router isis mpls
ip route-cache policy
end

IOS-XR

router isis mpls
is-type level-2-only
net 11.1111.1111.1111.1921.6820.5003.00
log adjacency changes
address-family ipv4 unicast
metric-style wide level 2

!

interface TenGigE0/0/1/0.1000
circuit-type level-2-only
!

interface TenGigE0/0/1/0.1000
ipv4 mtu 1500
ipv4 address 10.10.10.2 255.255.255.252
encapsulation dot1q 1000

SW-3850#sh ip ospf neighbor vlan 1000

Neighbor          ID        Pri State         Dead Time      Address          Interface
10.10.10.2        1        FULL/DR         00:00:39      10.10.10.2      Vlan1000

SW-3850#sh isis neighbors

Tag mpls:
System      Id       Type     Interface        IP Address       State   Holdtime     Circuit Id

So nothing appear in isis neighbors , plz any advice ,,

Kind Regards, 

Tariq.E

[rais]

I think you need to change your net to something like: 

 net 49.0000.1921.6820.5003.00

HTH. 

[Tareq Emad Al Asfoor]

Thanks for your replay ,, i have still the same issue 

[rais]

I would try configuring interfaces as point-to-point and make sure that MTU is the same on both sides.

Thanks.

[Tareq Emad Al Asfoor]

Is the same , And i set the MTU from IOS-XR 9190 and from IOS-XE 9100 .. This should be working fine .. any advice .. Thanks 

[Harold Ritter]

Hi Tariq,

On the XR side, you need to configure  "address-family ipv4 unicast" on the interface under the router isis rocess as follow:

router isis mpls
!
interface TenGigE0/0/1/0.1000
address-family ipv4 unicast
!

Regards,

[Tareq Emad Al Asfoor]

Hi Harold , 

Thanks for your replay , nothing changed

IOS-XE

ip router isis mpls
isis network point-to-point
router isis mpls
net 11.1111.1111.1111.1921.6820.5003.00
is-type level-2-only
metric-style wide level-2

IOS-XR

router isis mpls
is-type level-2-only
net 11.1111.1111.1111.1921.6820.5003.00
log adjacency changes
address-family ipv4 unicast
metric-style wide level 2

!

interface TenGigE0/0/1/0.1000
circuit-type level-2-only
point-to-point
address-family ipv4 unicast

[Harold Ritter]

Hi Tariq,

You should run a "debug isis adj" from either side and check what information you receive. This should give you more information on what is going on.

Regards,

[Tareq Emad Al Asfoor]

Thanks Harold for your replay ,  Below you will find what i get when i using "debug isis adj"

*Sep 18 15:42:01.024: ISIS-Adj: SND:3way Adj. Local Ckt ID:0x9D Nghbr Ckt ID:0x0 Length:5
*Sep 18 15:42:01.024: ISIS-Adj: Sending serial IIH on Vlan1000, 3way state:DOWN, length 1496
*Sep 18 15:42:09.963: ISIS-Adj: SND:3way Adj. Local Ckt ID:0x9D Nghbr Ckt ID:0x0 Length:5
*Sep 18 15:42:09.964: ISIS-Adj: Sending serial IIH on Vlan1000, 3way state:DOWN, length 1496
*Sep 18 15:42:18.349: ISIS-Adj: SND:3way Adj. Local Ckt ID:0x9D Nghbr Ckt ID:0x0 Length:5
*Sep 18 15:42:18.349: ISIS-Adj: Sending serial IIH on Vlan1000, 3way state:DOWN, length 1496
*Sep 18 15:42:25.982: ISIS-Adj: SND:3way Adj. Local Ckt ID:0x9D Nghbr Ckt ID:0x0 Length:5
*Sep 18 15:42:25.982: ISIS-Adj: Sending serial IIH on Vlan1000, 3way state:DOWN, length 1496

Any advice .. Thanks in advance ..

[Harold Ritter]

Hi Tareq,

Can you run the same debug from the other side as well.

Regards,

[Tareq Emad Al Asfoor]

I don't get any log from the XR side ..

[Harold Ritter]

Could you also post the output from the following commands:

XR:

show isis int TenGigE0/0/1/0.1000 brief

XE:

show clns int vlan1000

Regards,

[Tareq Emad Al Asfoor]

XE

SW-3850-24X#show clns int vlan1000
Vlan1000 is up, line protocol is up
Checksums enabled, MTU 1497, Encapsulation SAP
ERPDUs enabled, min. interval 10 msec.
CLNS fast switching disabled
CLNS SSE switching disabled
DEC compatibility mode OFF for this interface
Next ESH/ISH in 40 seconds
Routing Protocol: IS-IS
Circuit Type: level-1-2
Interface number 0x0, local circuit ID 0x9D
Neighbor Extended Local Circuit ID: 0x0
Level-2 Metric: 10, Priority: 64, Circuit ID: SW-3850-24X.9D
Level-2 IPv6 Metric: 10
Number of active level-2 adjacencies: 0
Next IS-IS Hello in 2 seconds
if state DOWN

XR

show isis int TenGigE0/0/1/0.1000 brief

Interface               All        Adjs            Adj Topos              Adv Topos             CLNS        MTU        Prio
                            OK      L1   L2           Run/Cfg                 Run/Cfg                                            L1   L2
----------------- --- --------- --------- --------- ---- ---- --------------------------------
Te0/0/1/0.1000   Yes      -      0               1/1                        1/1                        Up        9173     -       -

[Tareq Emad Al Asfoor]

it's too hard to remove it from the XR side or change it, Can i increase it from XE side although i set the system mtu "Global Ethernet MTU is 9194 bytes."