Hi Tony,
Yea it worked on my emulators. When replicated on Hardware devices they
form neighbor relationships easily and there is no mishap of turning off
the padding, i cant argue much on this as i am using emulators like XRV and
GNS3 in this case. Debug was not complaining about the 1497 IIH but looks
like that it the issue.
is there a show command to check if this has been configured if any apart
from show run.
I configured it on XR as well, but OS by default is hiding it in the
hierarchy when used with a show command, not sure if that is at its default.
Thanks so much.
router isis 1
net 49.0001.0000.0000.0006.00
is-type level-2-only
no hello padding multi-point
passive-interface Loopback0
!
R6#show isis neighbors
System Id Type Interface IP Address State Holdtime Circuit Id
XR2 L2 Fa0/0.620 20.6.20.20 UP 26 R6.01
router isis rak
net 49.0001.0000.0000.0020.00
log adjacency changes
address-family ipv4 unicast
metric-style transition
!
interface Loopback0
passive
circuit-type level-2-only
address-family ipv4 unicast
!
!
interface GigabitEthernet0/0/0/0
address-family ipv4 unicast
!
!
interface GigabitEthernet0/0/0/0.620
circuit-type level-2-only
address-family ipv4 unicast
!
!
!
On Sat, Jun 7, 2014 at 12:36 PM, Tony Singh <mothafungla_at_gmail.com> wrote:
>
>
> Debug isis adjacency on IOS device it should complain about the MTU
> padding being received as 4 bytes less than what the interface should
> support end result in no peering.
>
> 1497 bytes minus 3 byte LLC encapsulation, IOS device not like 1493 bytes
> seems the dot1q tag add overhead before being discarded..
>
> To disable the check
>
> IOS
> router isis
> no hello padding
> Or
> int f0/0.100
> no isis hello padding
>
> IOS-XR
> router isis abc
> interface GigabitEthernet0/0/0/0.100
> no hello-padding disable level [1/2]
>
>
> Design reason for this check is that no issues are encountered at a later
> stage with LSP packet exchange.
>
> In IOS & XR you can run a more intuitive check like the Junos
> implementation where padding is only checked upon adjacency thereafter it
> doesn't bother thus saving bandwidth too, can you imagine SONET HDLC with
> an MTU of 4470 consistently sending hellos
>
> --
> BR
>
> Tony
>
> > On 7 Jun 2014, at 06:20, GAURAV MADAN <gauravmadan1177_at_gmail.com> wrote:
> >
> > I believe that is mandatory . (but i can double check as well)
> > ISIS works smooth b/w IOS and XR for me till now and i have made it a
> best
> > practice to activate address-family on global as well as interface level
> .[
> > more or less like bgp ]
> >
> >
> >> On 7 June 2014 10:30, Rakesh M <raaki.88_at_gmail.com> wrote:
> >>
> >> i dont think that is the requirement Gaurav, anyways i have even tried
> >> that, must be a hardware issue , tried on INE labs and it works fine
> with
> >> the same configuration, virtualisation has its own impact on time ! :)
> >>
> >> Below is from INE lab
> >>
> >> router isis 1
> >>
> >> net 49.0001.0000.0000.0020.00
> >> interface Loopback0
> >> passive
> >> address-family ipv4 unicast
> >> !
> >> !
> >> interface GigabitEthernet0/4/0/0.620
> >>
> >> address-family ipv4 unicast
> >> !
> >> !
> >> !
> >>
> >> RP/0/3/CPU0:XR2#show isis neighbors
> >> Wed Oct 25 11:36:33.610 UTC
> >>
> >> IS-IS 1 neighbors:
> >> System Id Interface SNPA State Holdtime Type
> IETF-NSF
> >> R6 Gi0/4/0/0.620 0004.4e11.2800 Up 7 L1L2
> Capable
> >>
> >>
> >> On Sat, Jun 7, 2014 at 10:10 AM, GAURAV MADAN <
> gauravmadan1177_at_gmail.com>
> >> wrote:
> >>
> >>> on XR ; you have not activated the address-family on protocol level .
> You
> >>> have just activated under interface. Please correct the same
> >>>
> >>>
> >>>> On 7 June 2014 08:23, Rakesh M <raaki.88_at_gmail.com> wrote:
> >>>>
> >>>> Hi,
> >>>>
> >>>> I am trying to run isis between IOS-XRV 5.3.2 and Cisco 7600 Series,
> Both
> >>>> are emulated
> >>>> version for FYI.
> >>>>
> >>>> ospf appears to form fine, and IOS-TO-IOS ISIS is also fine, I am
> unable
> >>>> to
> >>>> relate
> >>>> why XR-IOS isis-adj is not coming up.
> >>>>
> >>>> !
> >>>> router isis 1
> >>>> net 49.0001.0000.0000.0006.00
> >>>> is-type level-2-only
> >>>> !
> >>>>
> >>>> R6#
> >>>> R6#show runn int fa0/0.620
> >>>> Building configuration...
> >>>>
> >>>> Current configuration : 182 bytes
> >>>> !
> >>>> interface FastEthernet0/0.620
> >>>> encapsulation dot1Q 620
> >>>> ip address 20.6.20.6 255.255.255.0
> >>>> ip router isis 1
> >>>> mpls ip
> >>>> mpls label protocol ldp
> >>>> isis circuit-type level-2-only
> >>>> end
> >>>>
> >>>>
> >>>> *Jun 7 08:21:11.159: ISIS-Adj: Sending L2 LAN IIH on
> >>>> FastEthernet0/0.620,
> >>>> length 1497
> >>>> R6#
> >>>> *Jun 7 08:21:16.019: ISIS-Adj: Rec L2 IIH from 000c.293b.1023
> >>>> (FastEthernet0/0.620), cir type L2, cir id 0000.0000.0020.01, length
> 1497
> >>>> R6#
> >>>>
> >>>>
> >>>> on XR
> >>>>
> >>>> RP/0/0/CPU0:XR2#
> >>>> RP/0/0/CPU0:XR2#show runn router isis
> >>>> Sat Jun 7 08:22:26.395 UTC
> >>>> router isis 1
> >>>> is-type level-2-only
> >>>> net 49.0001.0000.0000.0020.00
> >>>> interface Loopback0
> >>>> passive
> >>>> address-family ipv4 unicast
> >>>> !
> >>>> !
> >>>> interface GigabitEthernet0/0/0/0.620
> >>>> circuit-type level-2-only
> >>>> address-family ipv4 unicast
> >>>> !
> >>>> !
> >>>> !
> >>>>
> >>>> RP/0/0/CPU0:XR2#show runn int gig0/0/0/0.620
> >>>> Sat Jun 7 08:22:38.025 UTC
> >>>> interface GigabitEthernet0/0/0/0.620
> >>>> ipv4 address 20.6.20.20 255.255.255.0
> >>>> encapsulation dot1q 620
> >>>> !
> >>>>
> >>>>
> >>>> RP/0/0/CPU0:XR2#
> >>>> RP/0/0/CPU0:XR2#show isis int gig0/0/0/0.620
> >>>> Sat Jun 7 08:22:52.124 UTC
> >>>>
> >>>> GigabitEthernet0/0/0/0.620 Enabled
> >>>> Adjacency Formation: Enabled
> >>>> Prefix Advertisement: Enabled
> >>>> IPv4 BFD: Disabled
> >>>> IPv6 BFD: Disabled
> >>>> BFD Min Interval: 150
> >>>> BFD Multiplier: 3
> >>>>
> >>>> Circuit Type: level-2-only
> >>>> Media Type: LAN
> >>>> Circuit Number: 1
> >>>>
> >>>> Level-2
> >>>> Adjacency Count: 0
> >>>> LAN ID: XR2.01
> >>>> Priority (Local/DIS): 64/none (no DIS elected)
> >>>> Next LAN IIH in: 6 s
> >>>> LSP Pacing Interval: 33 ms
> >>>> PSNP Entry Queue Size: 0
> >>>>
> >>>> CLNS I/O
> >>>> Protocol State: Up
> >>>> MTU: 1497
> >>>> SNPA: 000c.293b.1023
> >>>> Layer-2 MCast Groups Membership:
> >>>> All Level-2 ISs: Yes
> >>>>
> >>>> IPv4 Unicast Topology: Enabled
> >>>> Adjacency Formation: Running
> >>>> Prefix Advertisement: Running
> >>>> Metric (L1/L2): 0/10
> >>>> Weight (L1/L2): 0/0
> >>>> MPLS LDP Sync (L1/L2): Disabled/Disabled
> >>>>
> >>>> IPv4 Address Family: Enabled
> >>>> Protocol State: Up
> >>>> Forwarding Address(es): 20.6.20.20
> >>>> Global Prefix(es): 20.6.20.0/24
> >>>>
> >>>> LSP transmit timer expires in 0 ms
> >>>> LSP transmission is idle
> >>>> Can send up to 10 back-to-back LSPs in the next 0 ms
> >>>>
> >>>>
> >>>> Blogs and organic groups at http://www.ccie.net
> >>>>
> >>>>
> _______________________________________________________________________
> >>>> Subscription information may be found at:
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> >
> >
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> >
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Received on Sat Jun 07 2014 - 13:44:10 ART
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