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Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
OL-26630-08
Caveats in Cisco IOS XE 3.9S Releases
Post fix caveat: With the fix for this issue, there are following limitations on the scale of prefixes:
1. Global labeled BGP prefix scale: 3200 2. VPN (with or without labeled-BGP nexthop) prefix
scale: 4000 3. Combination of Global labeled BGP and VPN prefix: less than 3200 depending on
number of VPN and number of labeled BGP prefixes.
• CSCue11444
Symptoms: Split horizon configurations doesn’t work on nile 1 with L2 multicast packets
Conditions: EFPs with split-horizon configured on nile 1 doesn’t honor SH conditions (remain just
using deja vu)
Workaround: shut/no shut. Configure EFP first before moving into split-horizon group.
• CSCue16617
Symptoms: QoS classification not working in core
Conditions: When Output policy applied to interface having the BDI as core interface.
Workaround: Enable "mpls ldp explicit null" on all the Routers.
• CSCue16828
Symptoms: b2b ping is not working - core side trunk efp PC with BDI
Conditions: when we have core side trunk efp pc with BDI and changed the port channel in core
side b2b ping is not working.
Workaround: Don‘t change the PC in core side.
• CSCue17123
Symptoms: ATM/IMA Ping Fails From 2nd Interface Post SSO In xe39 nightly.
Conditions: This is seen when you have multiple ATM interfaces and issue switchover. Traffic
doesn’t flow from 2nd interface after switchover.
Workaround: No workaround
• CSCue18015
Symptoms: No S,G created. Forwarding based on (*,G).
Conditions: Happens with IGP change leading to RPF change of the (*,G).
Workaround: Clearing th (*,G) and recreating should help fixing the problem.
Further Problem Description: Timing issue and hence chances of landing into the problem
depends on the events getting triggered.
• CSCue19898
Symptoms: (*,G) based forwarding can be seen with IIF change. IGP patch change to the source
might lead to this problem.
Conditions: If the IGP change, the RPF change notification comes. In that case we miss adding the
cpuq to the (*G).
Workaround: Timeout the (*,G) entry and recreating it again either by clear ip mroute or stopping
the joins.
• CSCue20022
Symptoms: -Core (S, G) entries will software switch with-out any hardware forwarding
Conditions: -IIF is PIM enabled BDI interface. -Scale EVCs configured under single port -Scale
BDIs as IIFs -Trigger: Flap main interface having EFPs
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