MSR5660 GRE封装后带宽问题

两台MSR5660相互间启GRE封装，硬件接口为千兆，但带宽速度约为30M，如何解决

Tunnel1 Current state: UP Line protocol state: UP Description: Tunnel1 Interface Bandwidth: 64 kbps Maximum transmission unit: 1560 Internet address: 1.1.1.14/30 (Primary) Tunnel source 10.10.18.10, destination 10.10.18.42 Tunnel keepalive disabled Tunnel TTL 255 Tunnel protocol/transport GRE/IP GRE key disabled Checksumming of GRE packets disabled Output queue - Urgent queuing: Size/Length/Discards 0/1024/0 Output queue - Protocol queuing: Size/Length/Discards 0/500/0 Output queue - FIFO queuing: Size/Length/Discards 0/75/0 Last clearing of counters: Never Last 300 seconds input rate: 380 bytes/sec, 3040 bits/sec, 3 packets/sec Last 300 seconds output rate: 1922 bytes/sec, 15376 bits/sec, 11 packets/sec Input: 1735578 packets, 933774518 bytes, 0 drops Output: 5601079 packets, 3406439471 bytes, 1 drops

Tunnel1 Current state: UP Line protocol state: UP Description: to-JSW-A-GRE Bandwidth: 64 kbps Maximum transmission unit: 1560 Internet address: 1.1.1.13/30 (Primary) Tunnel source 10.10.18.42, destination 10.10.18.10 Tunnel keepalive disabled Tunnel TTL 255 Tunnel protocol/transport GRE/IP GRE key disabled Checksumming of GRE packets disabled Output queue - Urgent queuing: Size/Length/Discards 0/1024/0 Output queue - Protocol queuing: Size/Length/Discards 0/500/0 Output queue - FIFO queuing: Size/Length/Discards 0/75/0 Last clearing of counters: Never Last 300 seconds input rate: 2028 bytes/sec, 16224 bits/sec, 11 packets/sec Last 300 seconds output rate: 463 bytes/sec, 3704 bits/sec, 3 packets/sec Input: 34516574 packets, 14040709186 bytes, 0 drops Output: 6937866 packets, 1301230255 bytes, 0 drops